So the mpu has corrosion. Mostly on left side and up to U15 it looks like. Game works 100% no issues with switch matrix or resets.
Being a believer of if it's not broke don't fix it but ALSO understanding this WILL get worst and something will stop working, what should I do?
1. Take it out and follow terry B's damage guide and replace all affected components.
2. Neutralize damage and wait until something breaks and revert to #1.
3. Play game until something goes wrong and revert to #1