As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, NR 4 FIRE WARNING HORN SOUNDED, THEN SILENCED AND SOUNDED AGAIN. THE CREW DISCHARGED BOTH BOTTLES AND SHUTDOWN NR 4 ENGINE. CREW RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MX REPLACED CORE FIRE LOOP, CORE LOOP CONNECTORS AND BOTH FIRE BOTTLES. OPS CHECK GOOD IAW MM 26-20-1, 26-10-1 AND ERH 70.01. ACFT WAS RETURNED TO SERVICE.