As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED OF FLIGHT DUE TO DURING CLIMB, THE LEFT FIRE DETECTION SYSTEM FAULT LIGHT TURNED ON. MAINTENANCE PERSONNEL PERFORMED LEFT ENGINE FIRE DETECTION TEST IAW AMM 26-10-00, DETECTING LOOP B OF LEFT ENGINE WITH FAULT; SO THE CIRCUIT BREAKERS A24, A21 ON PANEL P6-2 WERE RESEATED IAW AMM 26-11-00 AND THE WIRING IN CONNECTOR DJ2501 WAS FIXED IAW WDM 26-11-11 AND BOTH CORE FIRE DETECTOR WERE REPLACED IAW AMM 26-11-01, TESTED CORRECT.