Took another look at 1 point card reels today and found a short between 0 position and 2 - 7. When I pulled apart player 2 reel I found a big burn mark on the pad for position 6 which was shorting to the centre track (earth input for the reel) . I had noticed this when i overhauled the reel but didn't properly investigate at that time DOH!!!

As that pad was damaged (and lifting from the PCB) I have cut it off as I was concerned about further damage and probs down the track. This means player 2 won't bust when score changes from 16 to 26 but can live with that .

Thanks for all your time helping me with this one Gav , really appreciate it    .

The hard lesson I have learned is be more thorough in future .