As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3852 - EWR-MVY - DURING FLIGHT NR 1 ENGINE FIRE WARNING ACTIVATED. THE NR 1 AND NR 2 FIRE BOTTLES WERE DISCHARGED. MAINTENANCE INSPECTED ENGINE, SUSPECT POWER TURBINE FAILURE. REMOVED AND REPLACED NR 1 ENGINE AND NR 1 AND NR 2 FIRE BOTTLES IAW TASK CARD NR 72-00-00 AND 26-21-71.