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Have you tried stepping the PU and Coin unit by hand and/or checking them after each ball to see where they're lined up, etc.?
Quoted from ChipS:But the original issue - score jumping around when playing 1-player games - has not been corrected.
I think you're going to need to open up the PU and look for shorts or other oddities.
Quoted from ChipS:Any chance it could be the AX or BX relays? I don't understand enough about what they do - just throwing it out there.
No
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