As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 723, JFK - LAX (ETOPS). NR 2 ENGINE FIRE LOOP -A- FAULTED. ENGINE FIRE DETECTION SYSTEMS 1, LOOP A. FOUND #2 ENG LOOP A FWD FIRE / OVHT DETECTOR (4002WD2) FAILED INSULATION RESISTANCE CHK. REMOVED AND REPLACED #2 ENG FWD FIRE / OVHT DETECTOR ASSY 4002WD2 REF AMM 26-12-17. OPS CHK GOOD. NO FAULTS NOTED. MDDR REMAINS OPEN PER MCC SAI FOR MONITORING