As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#523, JFK-LAX. (ETOPS) ENG 2 FIRE LOOP A FAULT ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ); CHECKED PER TSM 26-12-00-810-805-A FOUND LOOP 4002WD1 SHORTED TO GROUND. REMOVED AND REPLACED LOOP 4002WD1 ON #2 ENGINE PER AMM 26-12-17. OPS NORMAL PER AMM 26-12-00. MDDR 580398 CLEARED.