My 1956 Gottlieb Scoreboard 4 player game pop bumper lights are not fully lighting up when activated. The top right bumper and lower left bumper lights are not lighting up fully I can see a faint glow on the filament when they should be on . It's probably a loose contact or bad solder from when I replaced them a year ago. I hadn.t noticed since I have been concentrating on the backboard lights lately and wasn't actually trying to play a game