I'm having an issue with this pin and am running out of ideas. Shows balls missing at start-up, does ball search etc. Checked opto on trough, did a re-flow, replaced them with new spares I have (twice). Ball trough test shows all balls missing. Switch test shows nothing on trough switches, opto. Checked roll overs on return lanes nothing. Hmmm. Reseated connectors under playfield still nothing on these switches, including trough switch. Any ideas? Seems like switches at bottom of playfield.

I checked all cabinet connectors, junk in the trough etc. In the switch test everything works but the trough switches, shooter lane, and
the 2 return lane roll overs. Seems like a common on the switch matrix maybe but I don't have a schematic. I also reset the connectors in the back box.