As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#33,BOS -CDG. (ETOPS) 'ENG 1 FIRE LOOP B FAULT AT CRUISE ALT. ALL INDICATIONS NORMAL (CLEARED ITSELF AFTER 30 MINS) ( ENGINE FIRE DETECTION SYSTEMS 2) LOOP B ); REMOVED AND REPLACE PYLON FIRE DETECTOR ENG #1 FIRE LOOP B IAW AMM 26-12-16. OPS CHECK GOOD, MDDR CLEARED. MX-4 UPDATED.