As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW CREW REPORTED LT ENGINE FIRE WARNING JUST AFTER GEAR UP. LIGHT INDICATION WENT OUT WHEN THROTTLE MOVED TO IDLE. EMERGENCY DECLARED FLIGHT LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND UPPER ANTI ICE DUCT RUPTURED. REPLACED ANTI ICE DUCT. SYSTEM GROUND CHECKED NORMAL. OPERATION (CLOSED)