As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CHRONIC LEFT ENGINE FIRE LOOP 2 MESSAGE IN CRUISE, ALWAYS TESTED OK ON GROUND. NO FIRELOOP MESSAGE PRESENT UPON ARRIVAL AT GATE, INSPECTED NR 1 ENG FIRE LOOPS FOUND NR 4 DETECTOR LOOP 2 (TS5254B) KINKED. REPLACED PER MM, OPS CHECKED GOOD ON THE GROUND.