/diy/ - Do It Yourself

hi /ohm/
i bought a japanese pachinko machine at a goodwill a few years back. i cant find a copywrite date on anything, but im pretty sure its from the 90s, maybe 80s. ive been using it as decoration, never really used it as intended. it sort of works; if i plug it in, i can get the balls to shoot, but none of the lights come on. i would really like to get it to light up, and ideally i would disconnect/bypass the motor so that it didnt make any noise at all when its lit up. im really just interested in the lights.
in pic related, the metal box in the lower half is obviously the power supply. the weird thing above that looks like some solenoids that control a dancing guy on the front. to the left of that, under that rats nest of wires, is a board with a bunch of connectors. there might be some logic on the other side of the board, but im currently under the impression that the whole thing is entirely analog.
feel free to ask for more pictures. ill post updates as im working on it. ideally, all of the lights plug into that board, and i can supply power to just that board. or maybe i could print a new board to replace it, and plug it into my computer to sync it with audio or some gay shit like that.
for starters, any ideas how to test if a given wire goes to a light? from what i can tell, the lights are inaccessible from the front.