As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED AN AIR TURN BACK TO PHL DUE TO NUMBER 1 ENGINE FIRE INDICATION SHORTLY AFTER TAKEOFF. MAINTENANCE FOUND THE NOSE COWL ANTI-ICE DUCT BLOWN. MAINTENANCE REPLACED DAMAGED ANTI-ICE DUCTS AND UPPER COWL DUE TO HEAT DAMAGE. AN ENGINE RUN WAS PERFORMED AND THE ANTI-ICE CHECKED OKAY. THE AIRCRAFT WAS RETURNED TO SERVICE.