What was found
FLIGHT DIVERTED TO DTW WITH A NR 1 ENGINE FIRE WARNING INDICATION. CREW REPORTED AT ROTATION OVERHEAT DETECTION LIGHT AND MASTER CAUTION LIGHT ILLUMINATED. CREW SHUTDOWN NR 1 ENGINE AFTER OVERHEAT LIGHT ILLUMINATED AGAIN AND DIVERTED THE AIRCRAFT TO DTW. FOUND WIRE W1508-006-16R (LOOP B) SHORTED AND BROKEN THRU AT CLAMP LOCATED AT 12 O'CLOCK POSITION ABOVE CORE ENGINE. ALSO FOUND WIRE W1506-044-16R (LOOP A) CHAFED THRU AT 10 O'CLOCK FAN POSITION. BOTH CORE LOOP A AND B FAILED MEGGER TEST. REPAIRED WIRE HARNESS, REPLACED BOTH A AND B CORE LOOP M1122. ACCOMPLISHED HIGH POWER RUN. BOTH A & B LOOP FIRE DETECTION SYS CHECKED NORMAL.