What was found
NR 3 ENGINE FIRE WARNING AT T/O 5 MINUTES. WARNING WAS INTERMITTENT. TESTED FIRE WARNING SYSTEM, TEST GOOD. INSPECTED NR 3 ENGINE FIRE LOOPS WIRE HARNESSES, FOUND A LOOP WIRE HARNESS CHAFED AND SHORTING OUT. REMOVED A LOOP WIRE HARNESS. REMOVED A AND B LOOP PYLON DETECTORS PER MM 26-11-03-4. INSTALLED NR 3 ENGINE FIRE DETECTORS "A" AND "B" PYLON LOOPS IAW MM 26-11-03-4. OPS CHECKS AND R-T-S-PASS FOR FDCU 3. NR 3 ENGINE COWLS CLOSED IAW MM 71-10-00.