I have a Diner that has the shooter lane and the Ball Trough #2 that register together when either one is activated. I have continuity between the WHT-BLU and WHT-YEL circuit. I have looked very closely at the switch matrix and at the wiring. I have tested the diodes and installed a new shooter lane switch and diode. I can't seem to find the error. The symptom in the game is that when a ball is locked, the trough will eject two balls. Thanks for your help.