Much of the left side of my Big Guns backbox lighting is out. Otherwise, the game plays just fine - all lamps on the PF seem to be functioning without issue.
I tried the obvious first - multiple known-good lamps swapped into each socket. No dice. Then I checked the backbox interconnect board, given its reputation. But continuity tests with my MM across each pin pair, top to bottom, were 100% successful. Is it possible that I could have gotten a false positive? I'm thinking this is a wiring issue. Or perhaps a bad component on a driver board?
You can see in the photo that all of the solid lamps on the left side are out, sans the top left three behind "BIG" (the upper-left most socket works, but needs to be cleaned or replaced as it is intermittent). The strobing gun lamps on the left work fine as well.
What would you all recommend I test next to catch this gremlin?
Also, what's up with this mini driver board on the back of the backbox door? Voltage readings on the labelled leads are much lower than what the labels read at the 28V and 50V pads, but perhaps that's normal?