Looking for help with my single drop target. The switch stopped registering in both game and test mode. I replaced the opto followed by the entire switch and that didn't fix the problem. All other switches in the same row and column of the matrix are working fine. The voltage at the switch is 5.01v. When the target is up, the green brown lead measures 1.88v and the tan black measures 2.65v. When the target is down, the green brown lead measures 3.29v and the tan black measures 3.49v. If I short the green brown lead with the tan black lead, the switch registers in test mode. This is why I assumed it was a switch problem to begin with. Now I'm at a loss and I'm open to suggestions.