What was found
PILOT UPON LANDING, PROCEDED W/ NORMAL ENGINE SHUTDOWN. AFTER ROLLING TWIST GRIP TO IDLE POSITION, AMBER GOV LIGHT ILLUMINATED. ENGINE WAS SHUTDOWN. FAILURE DETECTED ON VEMD, TEST REF 121 W/ LRU ENG START SWITCH LISTED AS FAILED. SWITCH WAS REPLACED. GROUND RUN REVEALED NORMAL OPERATION. ACFT LAUNCHED FOR RETURN. 5 MINUTES OUT, AMBER GOV LIGHT ILLUMINATED. PILOT LANDED, HANGAR AND SHUTDOWN. FAILURE DETECTED ON VEMD, TEST REF 121 WITH LRU ENGINE START SWITCH LISTED AS FAILED. TROUBLESHOOTING REVEALED FAULTY INTERMITTENT GROUND AT 1021N1 GROUND POINT UNDERNEATH CABIN FLOOR. CLEANED AND TREATED GROUND POINT.