Just a quick note to see if anyone has any hot tips. I haven't investigated this much yet but here's the deal. Grand Prix stopped resetting a few days ago, leaving 4000 on the P1 Score reels. Opened her up today and found the coil stop had come undone, along with one wire from the zero switch stack. Put that all back together, toggled up 1s on all reels and hit the Start button. All 20 reels reset and stop. The bonus units reset to zero. That's it. From then on, the score motor just runs and the Reset relay stays energized.
Anything else it could be besides reel zero switches and the bonus unit zeros? I did check the bonus unit zeros and they look to be OK. Didn't have time to check all the reels, but did check the one I repaired and it looks to making/breaking fine.
Thanks!
Dave