As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CREW PREFLIGHT, L ENG OH LP 2 EICAS(S). MAINTENANCE CONDUCTED CIRCUIT BREAKER RESET OF L OVERHEAT CARDS PER AMM 20-61-01, THEN CONDUCTED OPERATIONAL TEST OF ENGINE FIRE DETECTION PER AMM 26-11-00. FAULT DID NOT RETURN. A/C VERIFIED ETOPS 120. A/C RETURNED TO SERVICE.