I just rebuilt my pop bumper and now for some reason my lower right flipper wont flip. When I push the button you can see the flipper twitching, but it wont flip at all. It will hold up if I push the flipper up while holding the button. Has 75 volts at the coil. Swapped out the coil with no luck. Changed the fuse. Check all solder connections. The only change made to the game was the pop bumper switch.