What was found
NR 2 ENGINE OVERHEAT ILLUMINATED AFTER STARTING AND STABLIZED NO HOT START THE OVER HEAT LIGHT REMAINED ON FOR TWO MINUTES AND 53 SECS. ACFT GROUNDED. CLEANED ALL TERMINAL GROUND LUGS ON A AND B FIRE LOOPS ON NR 2 ENG IAW POWER PLANT BUILDUP MANUAL 71-00-02 AND MM 26-11-01-000-802. PERFORMED BITE TEST ON FIRE DETECTION MODULE PASSED. RAN ENG AT TAKEOFF POWER FOR 5 MIN AFTER POWER RUN 3 MIN LATER OVERHEAT LIGHT ILLUMINATED BITE TEST ON BOX FAILED. RANG LOOP A AND B NR 2 ENGINE IAW FIM 26-10, TASK 810, ALL LOOPS WITHIN LIMITS. RANG OUT WIRES FROM DP98 TO DP1510 AND DP1610 NO DEFECTS NOTED WDM 26-11-21,26-11-11. RAN ENGINE IDLE AND HI-PWR, UNABLE TO DUPLICATE DEFECT. R & R M279 CONTROL MODULE REF AMM 26-10-01 ACCOMPLISHED ENGINE FIRE SWITCH SYSTEM SHUTDOWN TEST IAW AMM 26-21-00-720-802 FOR THE NR 1 & NR 2 ENGINE, OPS TEST NORMAL. ACCOMPLISHED NR 1 & NR 2 ENGINE FIRE EXTINGUISHING BOTTLE SQUIB CIRCUIT TEST REF AMM 26-21-00-730-801, OPS TEST NORMAL. NR 2 ENG, OPS CK NORMAL ON ENGINE RUN.