ok, installed new eproms and finally got everything working...for several games. Then the game quit problem came back. I checked all coil diodes, and didn't see any ground problems in the new power and 6803 boards. Then it occurred to me that the slam switch description matches what the game is doing. Trouble is, the previous owner had cut the red & yellow wires and removed the slam switch. It's the only slam switch so I don't see how it can be registering. Any ideas?