May not be related, but want to know if yours has the EEE jumpers or not and AY-8912 IC. Mine has the jumpers, no IC but the serial numbers don't match and board isn't original to the game I'm sure. The info out there says this is right, but originally the board had the IC and had one jumper installed and didn't work at all, I took out the IC and put in all 5 jumpers but getting some strange sounds and patterns, for example hitting the rollovers or left or right most lane switches causes the game to go silent until I hit something else, and hitting any of the center targets makes it play a squeaky tone then "Malfunction" 3 times in a row. Odd for sure, and not right.

Yes thanks. I think the same Bally employee made my ROMs too! Does your board happen to have a sticker on it that says "EEM"?