got mine working.... I can’t believe it is related, but I had been awaiting some bulbs I ordered as only one worked... plugged in the second bulb and the feature is fully working. I thought the lighting was in parallel, not series, so should not have affected it, but it must do in some odd way...
Well, going to service the mechanism, clean and polish the cabinet, but leave all original... Stupid thing is, if I had put a jackpot in, it would probably be worth more as it is only odd nostalgic people who could appreciate....like me.
Might do a video when done.