What was found
NR 2 ENGINE FIRE LOOP A, FAULTED, HAS HISTORY FOR ENG 2 LOOP A, FAULT. PLACED ENG 2 FIRE LOOP A ON MEL 2612B. TROUBLESHOOTING CONTINUED IAW TSM 26-12-00-810-805-A, MEASURED RESISTANCE OF ALL LOOPS ON ENGINE 2 LOOP A. FOUND APPROX. 1010 OHMS TOTAL, PYLON LOOP MEASURED AT 4533 OHMS, CORE VENT LOOP MEASURED AT 3244 OHMS, AND CORE GEARBOX LOOP MEASURED AT 2172 OHMS. CORE GEARBOX LOOP SHOULD MEASURE BETWEEN 6469 AND 7150 OHMS. R & R CORE GEARBOX LOOP FIN 4002WD1 IAW AMM 26-12-17, OPS CHECKED OK MEL REMOVED.