What was found
AT APPROX 2000 AT DEPARTURE, GOT NR 3 ENGINE FIRE WARNING LIGHTS AND BELLS. INTERMITTENT AT FIRST 5-10 SEC AND STEADY AT 20 SEC PHASE 1 AND CHECKLIST COMPLIED WITH. SHUTDOWN ENGINE, DISCHARGED BOTTLE. NO FUEL DUMP. NO OTHER ABNORMAL ENGINE INDICATIONS. DIVERT TO SFO. LANDED UNEVENTFULLY. PRECAUTIONARY REMOVED AND REPLACED NR 3 FDCU. REMOVED AND REPLACED NR 3 ENG NR 1 FIREX CONTAINER. UPPER RIGHT A AND B LOOP FAULTED PART NR 224-0153-503 ADDED MPN 224-0153-503, CPN 2610519 QTY 1 DETECTOR MSN 982058.