As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ENGINE 3 FIRE WARNING DURING INITIAL CLIMB OUT. AIRCRAFT RETURNED WITH OUT FURTHER INCIDENT. MAINTENANCE FOUND BROKEN FITTING ON 13TH STAGE DUCT END CAP. REMOVED AND REPLACED END CAP. OPS AND LEAK CHECK GOOD IAW MM. AIRCRAFT RETURNED TO SERVICE.