As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2223, JFK-LAX. (ETOPS) ENG 2 FIRE LOOP A FAULT ( ENGINE FIRE DETECTION SYSTEMS 1) LOOP A ); REF TSM 26-12-00-810-805-A, AWM 26-12-06 AND AWM 71-51-75P. ACCOMPLISHED A VISUAL INSP. OF ENG 2 LOOP A ELEMENTS, NO DAMAGES NOTED. CHECK WIRING FORM FDU 2WD2 PINS A/J AND A/K VALUE ARE WITHIN LIMITS 1482 OHMS. REMOVED AND REPLACED FDU 2WD2 AS A PRECAUTIONARY T/SHOOTING IAW AMM 26-12-34. RAN ENG2 AT IDLE AND OPS TEST ENG 2 FIRE SYSTEM IAW AMM 26-12-00-710-002. ALL OPS CHECK OKAY. ORIGINAL SUBMISSION DATE: 10/6/2023