What was found
DURING NR 2 ENGINE START, OVERHEAT LIGHT ILLUMINATED EGT WAS NORMAL. OUTSIDE TEMP 100 DEGREE LIGHT WENT OUT ON SHUTDOWN, MOTORED ENGINE AND LIGHT CAME BACK ON. ACFT GROUNDED. PERFORMED ENG/APU FIRE DETECTION CONTROL MODULE BITE PROCEDURE NO FAULTS NOTED. REF FIM TASK 26-10, TASK 801. PERFORMED ENGINE AND APU-LOOP POWER-FAULT ISOLATION NO FAULTS OR DEFECTS NOTED,ALT DEACTIVATION PROCEDURE USED IAW CHAP 5, TABLE 3, ITEM 3, 4. OPEN ENGINE 2 INSPECTED ALL FIRE LOOPS AND ATTACHMENTS, NO DEFECTS. NO LEAKS NOTED DURING MOTORING. RAN NR 2 ENGINE OPS CK GOOD NO DEFECTS NOTED. FIRE DETECTOR MODULE BITE CHECKED GOOD. REPLACED NR 2 ENGINE LEFT CORE FIRE DETECTOR ASSY IAW MM 28-11-01-00-802. ENGINE FIRE DETECTION SYSTEM OPS TEST PASSED. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.