What was found
DURING CRUISE, FLIGHT CREW REPORTED INTERMITTENT FIRE WARNING ON NR 2 ENGINE. FLIGHT CREW FOLLOWED PROCEDURES IN AFM IN ORDER TO CONFIRM OR EXCLUDE VALIDITY OF INDICATION. FLIGHT CREW DETERMINED INDICATION WAS FALSE. MX TROUBLESHOT SYS AND DETERMINED THAT WITH ENGINE COWLING CLOSED, FIRE DETECTION LOOP RAIL 2 WAS INTERMITTENTLY SHORTING ON ACCY GEAR BOX. MX REPOSITIONED LOOP TO ALLOW INCREASED CLEARENCE BETWEEN GEARBOX AND 5 LOOP. FUNCTION CHECKS OF THE SYS INDICATE NORMAL OPERATION. THERE ARE NO DEFECTIVE PARTS INVOLVED.