What was found
PILOT REPORTED THAT DURING APPROACH TO LANDING, HE GOT A AMBER GOV LIGHT. HE ABORTED LANDING AND DIVERTED TO EL PASO FBO. VEMD FAULT CODES WHERE SW ENG CTL (HEX 4204 AND HEX 000C) EMM REFERRED TO START STOP SWITCH, AIRCRAFT JUST CAME OUT OF HEAVY MAINTENANCE FROM LRU M FACILITY AND HAD HEADLINER TAKEN DOWN DURING MAINTENANCE. AT ELP I REMOVED THE START SWITCH HEADLINER AND COVER INSPECTED WIRING AND TERMINALS. AMBER GOV LIGHT OPS CHECKED GOOD ON GROUND TESTS. PERFORMED OPERATIONAL GROUND RUN WITH NO FAULTS OR GOV LIGHTS. COULD NOT DUPLICATE AMBER GOV LIGHT. AIRCRAFT RETURNED TO SERVICE. PILOT FLEW BACK TO DEMING NM BASE AND REPORTED BACK TO MECHANIC NO ISSUES AND NO GOV LIGHTS.