What was found
DURING AIRFRAME INSPECTION, THE REVERSE CURRENT RELAY WAS REMOVED FOR INSPECTION AND RECERTIFICATION. THE RELAY, WHICH WAS FUNCTIONING NORMALLY WHEN REMOVED, WAS ROUTED TO A RATED REPAIR STATION FOR CHECK AND RECERTIFICATION. UPON RETURN FROM VENDOR, UNIT WAS RE-INSTALLED AND OPER CHKS PER MM. AFTER ELEC POWER APPLIED, EXTENSIVE DAMAGE OCCURRED TO WIRING FROM MAIN POWER JUNCTION BOX TO OVERHEAD PANEL START SWITCHES. REVERSE CURRENT RELAY, PN B3651M0-250, SN 2324, WAS DETERMINED DEFECTIVE AND REPLACED. RELAY REPLACED WITH NEW UNIT PN B3651M0-250 AND DAMAGED WIRING REPLACED FROM MAIN POWER JUNCTION BOX TO OVERHEAD PANEL START SWITCHES. SUBSEQUENT OPER CHECKS WITH ENG RUNS REVEALED NO FURTHER DEFECTS. (X)