Quoted from dahlman:
Btw, trouble shooting some lamps.
(All lamps out on row 1 in the matrix except for extra ball on the upper playfield) what is backbox tail 71? Guessing it's that strange socket on the backbox? Also seems like almost half the lamps don't work in the backbox ...Mabey related problem...? Mabey wrong thread for this
I would think this will get better attention in a repair thread rather than game specific since this is a generic issue.
But - If all but one lamp in the row is out I would assume the wire Red with Brown stripe is broken between the game over lamp and the next one in the chain. If you are lucky it is right at the game over lamp socket where 2 wires should be daisy chained and one hopefully broken off.
The next one must be that Back Box tail (not shown in manual). But you can confirm the continuity break in the Red-Brown wire to one of the bulbs you can find for now. (11,21,31,41,51,61) Having that tail 71 lamp being in the lamp chain would be strange because you normally do not have bulbs in the back box and playfield on the same connector. This way you can unplug and remove the playfield.
Backbox lamps being out sounds like a GI wire or burned connector. Probably not related.