As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#288, LAX-BOS. (ETOPS) 'FIRE - ENG 1 LOOP B FAULT RANDOMLY POPPS ON 2-3 SECONDS AND DISAPPEARS ( ENGINE FIRE DETECTION SYSTEMS 2) LOOP B ). FIRE LOOP B REPLACED AND TESTED IAW AMM 26-12-16. THIS CLOSES MDDR 533161. MX-4 UPDATED. PLACARD REMOVED.