When I press the start button, the scores reset but the flippers don't work and the ball doesn't eject. There is a loud buzzing coming from the coil that controls the ball count. It appears to be stuck on and I'm not sure why. I can manually rotate the back of the unit to game over. If it's related, the alternating light function was not working well before this happened. The lights would briefly alternate but then go back to the right outhole lit position. Everything else was working correctly. I don't have a schematic.