This will likely sound like a silly question to most but I am new and stuck. Recently acquired black hole. one pop bumper was skittish. would work then not work. we would lift play field move things (wire, switch, moves the bumper from below ) around then it would work for a while. it still had trouble working from a front hit. I adj the switch and it was so close another bumper would set it off at times. Now its dead even when I have switch make contact . I tried switching the pop boards with neighbor bumper and the neighbor works 100%..so not board. when I push the bumper down it registers a score, just doesn't pop. how do I know if its a bad switch, ( which I can push together and get nada) or its a bad coil, lack power to to coil? If it was lack of power would it still score when I push it down..

thanks! Clicked wrong one