As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1107, JFK-LHR. (ETOPS)' ENG 1 FIRE LOOP B FAULT; REFERENCE TSM 26-12-00-810-804A BITE CHECK OF FDU OK. PERFORMED RESISTANCE CHECKS ACROSS AGB CORE AND PYLON LOOPS "B". ALL WITHIN ALLOWABLE LIMITS. NO DAMAGES NOTED TO LOOPS DURING VISUAL INOP. AS PRECAUTIONARY REPLACED ENG #1 FDU AGB LOOP B AND CORE VENT LOOP B. MDDR CLEARED. MX-4 UPDATED.'