Quoted from JWV:Or reflow the solder of the connector pins on the board, these tend to crack due to the shocks and shakes of the game play. In my case the bulb was just dead and replaced it, now it is much brighter than the other two multiball inserts.. This machine is eating bulbs, replaced so many already since I bought it! Lol
I agree, I'll bet the pins just need to be flowed on the lamp board.