Quoted from mkdud:I should have explained more clearly; the 2nd rollover in from the shooter lane is racking up credits. This is switch # 2. The unusual thing is that none of the other rollover switches are doing this, just the 2nd one in from the shooter lane. Please help if you can. Thanks, mk
I would try putting the game in switch test and see what number comes up on the displays when you try the various rollover buttons. Page 17 of the manual has the chart you can refer to for the numbers that correspond with the switches during the test. Screenshot_20200726_064507_com.google.android.apps.docs(1).jpg
Also, it's worth noting those rollover buttons each have a 0.05 uf ceramic cap wired to the switch. If a cap fails even on just one of the switches, it can sometimes cause erratic behavior elsewhere on the switch matrix. Easiest thing to try first is snipping one of the legs of the cap where it attaches to a switch. Try snipping one leg off the cap for the 2nd rollover button switch, then test it again. If that solves it, it's still recommended to replace the cap to ensure quick activations of the switch still register. The game can still be safely played with the cap snipped off though. Again, there's several switches with caps on them--just check the switch matrix chart in the manual to find the rest of them. (Arrow is pointing at the capacitor symbol for reference, also note that not all switches use caps) 1475347108.png
If snipping the cap from the 2nd rollover doesn't fix it, try the others. For long-term reliability, i would recommend replacing all the switch caps for any of the switches that use them.
Good luck!