So in a pile of parts from a Gottlieb Haunted House there was an extra display with writing on the glass saying "Do NOT use will damage MPU". The dots on the glass are still black, not white, so I assume the glass might still be good. What could cause the damage to the MPU? I am replacing capacitors on the other 4 displays as well as the IC 6118's. If I replace all the caps, the IC's, and the resistor, will that fix what is going on in the display that says it has an issue?