As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#7, JFK-LHR. (ETOPS) 'INTERMITTENT ENG2 FIRE LOOP A FAULT ECAM ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ); PERFORMED INSULATION CHECK OF ENG #2 LOOP A AGB LOOP. PIN A TO SHIELD FOUND SHORTED. REMOVED AND REPLACED ENG #2 AGB LOOP A IAW AMM 26-12-17. OPS CHECK OK. THIS CLEARS MDDR # 579199.