OK....here is what happened. Wife adds credits to Gorgar and went to play. The flippers locked on and a burnt smell filled the room. Then she called out to me to see what was going on and the pin is still on.
So power was on for what I feel was a long time. This is what I can tell so far. Game boots up, light work as they should. No coil is fried and seem to work.
When a game start, the sound is messed up. Hitting the diagnostics switch on the sound boards, all sounds sound good along with voice.
For the life of me, I can not find anything burned. I will know more tomorrow as I swap boards out. I got a working MPU and driver board to test with. Oh and power supply if needed.
Other then swapping out boards, what is the best approach to narrow down this problem?