Why is my MBP serial number and model year no longer displayed in "about this mac" (have NOT replaced logic board)?

I have not replaced or manipulated the logic board (or any other hardware) on my mid-2012 13 inch MBP. Under the "about this mac" tab, the serial number is no longer displayed (it now states "unavailable") and the model year is also no longer displayed. I understand that I can find the serial number and model year several other ways, I am seeking to determine why this happened and if it could indicate further problems.
Has anyone else experienced this?
Thank you in advance for any help or insight.
JB

Man oh man. What a day. New symptoms again!
Lets start with the MBP dying in its sleep. I closed my MBP and left it for a few hours to come back to find it completely dead. Looked into this issue and with the help of the activity monitor cleaned up some things, turned off some sharing settings, got rid of some extensions, etc. Seems to have solved this issue.
Later on, I picked up my MBP while it was on with my left hand and the same display (horizontal lines), freeze, auto shutdown happened. Out of curiosity I tried to recreate the symptom. Sure enough, pressing (with little force) on the left side of the bottom case caused it to happen again. I researched this a bit and found several possible culprits (bad logic board, metallic sticker may cause shorts, bad RAM bank, google drive). The google drive one really surprised me, I removed google drive (worked for many people) and it did not fix the issue. A buddy had some good RAM for me to use today so I swapped it out and had the same issue. Decided to test the individual RAM banks and it turns out that the deepest bank must be faulty. Running with only one 4 gig stick in the outermost bank and the freeze, shutdown, beep issue is gone!
So, it seems I have fixed the dying in sleep problem and have a temporary work-around for the bad RAM bank. The SN issue remains.
I am going to try to find out what could make a RAM bank be faulty and if there is a way to repair it.
What are the chances that all this happens as soon as I try to find out why the SN is unavailable??
Below is the thread that I found interesting and useful.
2011 Macbook Pro 3 Beeps/Freeze

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This topic first appeared in the Spiceworks Community

The pin in picture looks liek a 5mm pin and one one on docking station is a smart pin. So you would need something like the one in picture in this link.
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