What was found
WHEN STARTING ENGINE NR 2 WITH NR 2 LOOP B ON MEL, LOOP A SELECTED. THE ENGINE 2 OVERHEAT LIGHT ILUMINATED ON START AND EXTINGUISHED WHEN ENGINE WAS SHUTDOWN. ACFT GROUNDED. OPENED ENGINE NR 2 FAN COWLS & CHECKED LOOPS FOR OBVIOUS DEFECTS. NO DEFECTS NOTED. ACCOMPLISHED FIRE DETECTION UNIT BITE IAW AMM 26-11-00. A LOOP SHOWS NO FAULTS. B LOOP CURRENTLY ON MEL, REF LOG PAGE 11665249. GROUND RAN NR 2 ENGINE OVERHEAT LIGHT DID NOT ILLUMINATE. SYS GROUND VERIFICATION TEST NORMAL. REF LOG PAGE 11665253 FOR FURTHER TROUBLESHOOTING AND REPAIR.