greetings, when i try to reset my pin players for three and two all reset correctly but when it reaches number one the tens and the hundreds lock on and it will not progress there. If I keep unplugging and plugging the machine back in till it resets to zero all the sudden the bell will go off and it will lock on for 100 points. I checked the play field and the 10 points relay and all the other relays on the bottom mech board and I don’t see anything sticking I tried looking at the score motor but it is an old cylinder one and it’s hard to see between the different levels of the switch is the moving in and out. Any ideas what else I could check?

thanks in advance.