What was found
AFTER DEPARTURE ON CLIMBOUT THE ENGINE NR 2 OVERHEAT LIGHT CAME ON, FOLLOWED QRH PROCEDURES. AFTER BRINGING THROTTLE TO IDLE, LIGHT WENT OUT, RETURNED TO PSP. ACFT GROUNDED. REPLACED ALL 4 NR 2 ENGINE FIRE DETECTORS AND M279 MODULE, REF AMM 26-11-01, NO HELP. AFTER 15 MIN OF IDLE ENGINE RUN, NR 2 ENGINE OVERHEAT LIGHT ON. REINSTALLED UPPER FAN DETECTOR, M1757, DUE TO FAULT DURING M279 BITE, REF FIM 26-10, TASK 801, NO HELP. ACCOMPLISHED ENGINE BLEED AIR SYS LEAK CHECK USING THE APU, REF AMM 36-11-00-700-802, NO LEAKS FOUND, OPS CHECKS GOOD AT THIS TIME. FOUND DEFECTIVE WIRING HARNESS AT FWD OF UPPER FAN, M1757, DETECTOR CAUSING NR 2 ENGINE A AND B LOOPS TO NOT TEST. ACCOMPLISHED ENGINE HIGH POWER RUN UP, REF AMM 72-00-00, DUPLICATED FAULT AFTER 10 MINS. R & R UPPER FAN DETECTOR AND EXHAUST HARNESSES, REF AMM 26-11-01-02. R & R ENGINE/APU CONTROL PANEL, REF AMM 26-00-01. REPLACED NW316 WIRE HARNESS B-LOOP, REF AMM 26-11-02. HIGH POWER ENGINE RUN FOUND NO FAULTS.