As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED BOTH FIRE LOOPS INDICATION FOR LEFT ENGINE ILLUMINATED ON CLIMBOUT THEN FIRE WARNING INDICATION ILLUMINATED. EMERGENCY DECLARED, RETURNED TO DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. OPENED LEFT ENGINE COWLINGS AND FOUND ANTI-ICE DUCT HAD RUPTURED. REPLACED LEFT AFT ANTI-ICE TUBE ASSEMBLY. SYSTEM GROUND CHECKED NORMAL OPERATION.