Keyboard/mouse variably function

My keyboard & mouse stop functioning unpredictably. Problem persists after repairing disk,permissions;also tried taping KB cable under battery, no luck. Can use USB KB & Mouse. All other functions seem OK. Machine is > 3 yrs old. Should I chuck it? Is it likely an OS problem? I also must attach USB KB to launch Windows from Bootcamp (ie. the KB won't work before Mac OS launches). Thanks for any clues, suggestions. I've had the problem intermittently for 6 months or more, but it is now more persistent.

Intel-based Apple Portables: Troubleshooting unresponsive trackpad issues
I had the bloated battery problem 9 mths ago, or so, and replaced the battery as soon as possible->*could this have damaged the KB/trackpad connection?*
It's possible if the battery was leaking.

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