So, I recently bought a Genesis which I understood wasn't exactly booting when I got it. He told me he had gotten it to boot by pushing on the piggyback chip on the MPU. I tried this myself but couldn't get it to do anything. So, I pulled the board out and removed the piggy back chip and found that along with a few lifted traces the position and pins where that chip plugs in is darker than the rest of the board. There's also a sort of residue around the pins. It almost looks like glue or something.
So, what is this indicative of and what steps do I need to take to correct it. ?