As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW SHUT DOWN THE NR 3 ENGINE AND RETURNED TO IAD DUE TO NR 3 ENGINE FIRE BELL AND LIGHT INDICATION AT 1500 FEET. *S/D* MAINTENANCE FOUND Y DUCT BETWEEN 13TH STAGE AND TAI BLOWN. Y DUCT WAS REPLACED. ACCOMPLISHED ENGINE RUN WITH NO FAULTS FOUND.