What was found
FLT#1107, JFK-LHR. (ETOPS) ' ENGINE 1 FIRE LOOP FAULT CAME ON 3 TIMES DURING FLIGHT FOR AN INSTANT. ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ); FOUND CORE AGB LOOP A (4002WD1) DEFECTIVE AFTER FOLLOWING TSM 26-12-00-810-803-A. REPLACED CORE AGB LOOP A (4002WD1) IAW AMM 26-12-17, OPS CHECK OK. THIS CLEARS MDDR, PLACARD REMOVED, MX-4 UPDATED. A/C OK TO CONTINUE SERVICE.