As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT AIR RETURNED DUE TO NR 3 ENGINE FIRE WARNING ILLUMINATED ON TAKEOFF CLIMB. CREW COMPLETED CHECKLIST. LIGHT EXTINGUISHED AFTER NR 3 THROTTLE AT IDLE. MAINTENANCE FOUND NR 3 ENGINE 8TH STAGE DUCT CRACKED AND UPPER COWL DAMAGED. REMOVED AND REPLACED NR 3 ENGINE 8TH STAGE DUCT IAW MM. LEAK CHECK GOOD ON ENGINE RUN. ACCOMPLISHED SRM REPAIR ON UPPER COWL IAW SRM.