I'm a newbie at board diagnosis and board repairs beyond a shotgun repair kit that replaces all the commonly failed parts. But I'd like to repair this WPC flipper board if I can. I've narrowed it down to a board problem after rebuilding the flippers in my Creature and finding the left one completely dead. I went through all my work, tried a lot of things, then finally swapped in the flipper board from my Judge Dredd and bingo, the left flipper worked again. So I know it's a board problem.
What on the board would likely cause the left flipper to go dead? It happened immediately after a full flipper rebuild. Thanks!