Quoted from PinballManiac40:On occasion, you can use a heat gun and it may start working again for a short time. Other times freeze spray can also restart it briefly. Just depends if the failed part was heat or cold sensitive. If you have either a heat gun/freeze spray, try U5 first.
I've seen this first hand (in front of my own eyes) with a WPC-95 AV ASIC. My buddy freezed it and it started to work (then failed again). I'm software by trade so I'm used to having reliable hardware.