As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 2220 (1107) JFK- LHR (ETOPS). ENG 2 FIRE LOOP A FAULT ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ). REMOVED AND REPLACED ENG 2 CORE LOOP A FIRE OVERHEAT DETECTOR AND OPS CHECKED PER AMM 26-12-17, OPS CHECK OK AND FAULT CLEARED. MDDR CLEARED PLACARD REMOVED, MX-4 UPDATED MCC NOTIFIED.