Coffee spilled on Macbook Pro, still works but shuts off randomly

Hello,
A Macbook in the family had coffee recently spilled on the keyboard. It was immediately un-plugged and flipped upside down and left powered off for a week or so. I took it apart and cleaned what residue I could find off with rubbing alcohol on the logic board and any other parts including the charging circuit board. I re-assembled it and tested it; sure enough it powered up perfectly fine and all works well.
However, it is not totally working flawlessly. It will be working fine for maybe 20-30min then randomly shuts off cold (as if the power button was held down). The next time it is powered up, sometimes it requires several presses of the power button. When the screen finally comes up, the screen shows the gray, out of focus picture of my desktop with the block progress bar. Once the progress bar finishes, all is well until the next power down.
I am wondering if anyone knows a specific component I should look at as suspect to this problem. The logic board appears to be fine with a few spots not perfect. I have ordered a new Mag Safe charging component as this circuit board has a lot of corrosion. I thought I should look at where the power button attaches to the logic board to see if there is a short that could simulate holding the power button down and didn't find anything out of the ordinary. I wouldn't think the power button would need replacing as it is mounted higher up off the bottom of the case, but it may be worth replacing?
Any suggestions would be helpful.
Thanks

Spill Cleaning
And, don't think that just because it was two teaspoons and not a glassful that there is a difference.
Some liquid has just spilled into your Mac. What should you do?
Do
Immediately shut down the computer and unplug the power cord.
Remove the computer's battery (if you can)
Disconnect any peripherals (printers, iPods, scanners, cameras, etc.)
Lay the computer upside down on paper towels to get as much liquid as possible to drip out.
Note what was spilled on your Mac.
Bring the computer into an Apple store or AASP as soon as possible.
Don't
Don't try to turn it back on. Liquids can help electrical current move about the components of your Mac in destructive ways.
Don't shake the computer (this will only spread the liquid around).
Don't use a hair dryer on it (even at a low setting a hair dryer will damage sensitive components).
Do not put in a bag of rice in as much as rice will get into the ports and optical drive and do further damage.

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    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
    ☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
    Step 1
    For this step, the title of the Console window should be All Messages. If it isn't, select
              SYSTEM LOG QUERIES ▹ All Messages
    from the log list on the left. If you don't see that list, select
              View ▹ Show Log List
    from the menu bar at the top of the screen.
    In the top right corner of the Console window, there's a search box labeled Filter. Initially the words "String Matching" are shown in that box. Enter "BOOT_TIME" (without the quotes.)
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    For example, if the system was unresponsive or was failing to shut down for three minutes before you forced a restart, post the messages timestamped within three minutes before the boot time, not after. Please include the BOOT_TIME message at the end of the log extract—not at the beginning.
    If there are long runs of repeated messages, please post only one example of each. Don’t post many repetitions of the same message.
    When posting a log extract, be selective. A few dozen lines are almost always more than enough.
    Some private information, such as your name, may appear in the log. Anonymize before posting.
    Please don't indiscriminately dump thousands of lines from the log into this discussion.
    Please don't post screenshots of log messages—post the text.
    Step 2
    In the Console window, select
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              View ▹ Show Log List
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    In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
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    < Email Edited By Host >

    Spill Cleaning
    Some liquid has just spilled into your Mac. What should you do?
    Do
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    Remove the computer's battery (if you can)
    Disconnect any peripherals (printers, iPods, scanners, cameras, etc.)
    Lay the computer upside down on paper towels to get as much liquid as possible to drip out.
    Note what was spilled on your Mac.
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    Don't
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    Don't shake the computer (this will only spread the liquid around).
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    Thank you everybody for all the replies!
    First off, I think we'll wait what the 11th of june will bring us, hopefully a new mac mini. As Michael Wasley stated, the glossy imac screen isn't going to work for him. So that brings us to a Mac Mini or Macbook Pro. I'm using the macbook pro myself for the last couple of years and i'm a great fan of it's capabilities.. but my brother prefers a fixed 'computer' and not a laptop..
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