Unboxed 2 year old switch for the first time. All functions appear to work in both track-powered and constant-voltage modes, except for controller. Controller show no green or red lights. Controller does make switch points move in normal manner. A VOM shows no voltage at RSC Lights connection port on underside of switch. No voltage detected at pin on the printed circuit board that appears to feed the plug connection for yellow wire that goes to the RSC Lights port. VOM does indicate electrical continuity between pin on printed circuit board and RSC Lights connection port.
Asking for suggestions of other points to investigate before I go shopping for a replacement circuit board.