As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE WARNING BELL AND MASTER WARNING DURING CLIMB OUT. NO FIRE LIGHTS OR EICAS. REMOVED AND REPLACED 1AD04 CARGO FIRE AFT DIODE CIRCUIT CARD ASSY IAW KA AMM 26-10-01. PERFORMED OPS TEST IAW KA B747-400 AMM 26-16-10. OPS TEST GOOD. NO DEFECTS NOTED.