As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#215, JFK-SFO. (ETOPS) ENG 2 FIRE LOOP B FAULT INTERMITTENT ( ENGINE FIRE DETECTION SYSTEMS 2) LOOP B); REF LP # 4324107 ITEM #2 FOR R/R OF ABG ENG 2 FIRE LOOP B. NO FAULT NOTED SINCE REPLACEMENT. BITE TEST OF FDU 2 CARRIED OUT IAW AMM 26-12-00. NO FAULTS THIS CLEARS OUT MDDR. MX-4 UPDATED. PLACARD RMVD.