On some machines there’s a mechanical coin flipper under the coin Mech,so every other coin will trip the coin switch.

Any possible dates of the next one coming up?

Any word on the next repair clinic?

The 10-ace reset relay, 1-9 reset relay and the outhole relays all share their hold circuits on BLU-R wire going to score motor cam 5 switch B.
Cam 5 is 6th in line after the motor and switch B is a normally closed switch just below the top switch. Clean and adjust if needed.