Hello, I just picked up a Silverball Mania (unworking) ... I am an EM guy so really need some input here ... Is this acid damage/corrosion on bottom edge of MPU board? (photos 1 and 2) ... Battery looks good (photos 3 and 4) .... maybe the MPU was taken out of another game that had battery acid damage??? Is it possible to repair this? how difficult? saw a new board on EBay for $180 (photo 5) ... seems very reasonable ... are all the new boards about the same or is one brand a lot better ? THANK YOU !!!!