I have a Judge Dredd , Had an issue with 12vu that was repaired and working now, also had an issue with volume down that was repaired along with a vram installed, board was clean, no visible acid damage, he said all switches were fine when in his game.. I put it in and kept saying "slam switch stuck" and would flash something before that really fast, switches are all fine, even disconnected them, turns out after doing some digging, that if you go to switch edge, that any switch on rows 1 and 2 on the Matrix will activate the other as well.. I you activate 12, it will also activate 22, if you activate 14, it will activate 24 as well, etc...
I removed j212 and same thing still, and them removing j209 and same thing..
So I guessing problem is in the board ? or can it be something else ?