Hey guys, I'm cross-posting a problem I'm having here from the general tech forum for a bit of greater exposure:

Every few (like two or three) games my TZ will report "Check Gumball Machine Diverter" and default to simulated powerballs. I can sometimes fix it for a couple games by starting a game with the glass off, manually hit left then right ramp and then load the gumball machine. A few normal games later TZ will return to believing there's a problem and back to simulated powerballs it goes, even though balls are diverted where they need to go. I cleaned the opto before the vertical upkick into the GB machine and the switch in the small trough leading there performs properly in testing. As far as I know, these are the two main areas past posts here and and in rec.games.pinball have pointed to as problem ones. Both the subway and trough sensors are able to differentiate between regular balls and the powerball properly.

I don't know where to go from here - I'm so close to having TZ function at 100% but the powerball is such a big part of functionality and personality of the machine.

Any guidance would be greatly appreciated!