As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1339 - EN ROUTE DFW-SEA - FIRE WARNING LIGHT ILLUMINATED AFTER TAKEOFF. LANDED DFW WITHOUT INCIDENT. INSPECTED ENGINE AND FIRE WARNING SYSTEM. PLACARDED A LOOP FIRE WARNING INOPERATIVE PER MEL. REPLACED RIGHT ENGINE ANTI-ICE SUPPLY DUCT ON LEFT SIDE OF POWER PLANT BETWEEN ENGINE BLEED AND VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)