Is the thousands runout switch (open at zero) dirty or out of adjustment?

metalguy didn't answer the question Studentprince asked:

The reset and point scoring are managed by two separate circuits. That is why during the game you have no issues. Only during reset.
Green below is for reset. Yellow is for point scoring.

I recommend using an alligator clip jumper on the "1st Thousands runout"
Start will all other reels at zero and the reel with the issue at 1.
If the reel never stops. Then I suspect it is the runout switch is opening too soon and will need to be adjusted to a little tighter.

If the reel stops or doesn't move at all
remove the reel jumper and Jumper P3C and repeat the test. If it stops at zero the P3C is the issue.
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These are the jumpers

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Hi had same trouble in my Hot Shot, after dismounted decagon reel, clean-it in a professional ultra sound machine and adjusted all switches yet stil "stucking" . Was solved removing washer "spring" as indicated in the picture . So repeated the process in all scores and my machine is like new . I think as time passes (almost 50 yrs!), plastic score reel dilate .

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I would guess that more likely, the circuit board absorbed moisture and expanded in thickness???

Its possible the circuit board changed thickness, i will measure it and publish tomorrow.

I've encountered your same issue with a decagon before. With the original washer included, the unit had too much friction and would hang up at 8/9. I too removed the washer and then it worked ok. I didn't bother to analyze the failure mechanism though. I just don't think I've heard of any type of plastic that can expand with age.