So after reading through this thread no one’s seemed to ask about the specific board you installed and if it is actually defective. And if it is defective was it in a way to cause damage to the game? Someone needs to bench test the actual reset board to see if there is a manufacturing defect. A bad part or something on it causing a short. Or worse instead of providing a clean 5V it causes an over voltage. At this point no one knows until that is tested. If it truly is defective like that then the thread topic is appropriate. Otherwise it may be ok and just highlighted other weak points in a stressed machine.
I’ve rebuilt many WPC MPU and driver boards. These reset boards can be good as a temp fix or for testing but as others point out shift the load somewhere else. This isn’t a problem on many machines that are as delivered and can run for years. On other machines with mods that draw additional resources from the same point as the reset board you can have issues. If that is the case here then adding that reset board pushed it past that threshold and something gave out on the driver board. Could be as simple as a fuse to get you back to where you were. If this ends up being the case you can remove mods or power them separately if you still want to use that reset board. But I would just get your original boards serviced.
Unless your game was overfused it probably won’t need bridges unless someone prior did a hack job replacing some of those in the past. More often I’ve seen bad connections at the 5V regulator or some of the large 15000uf caps and other electrolytic caps bad. Some replace the 5V regulator with a newer switching style or there are a couple mods for the 5V section to improve it.
On the MPU unless it was damaged there probably isn’t any service that would need except for the small axial electrolytic cap. If it is silverish blue then it is trash and needs replacement. Otherwise it is probably ok.