As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED FUMES IN CABIN DURING FLIGHT. ACCOMPLISHED QHR. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND BLOWN ANTI-ICE DUCT ON NUMBER 1 ENGINE. REPLACED DUCT. SYSTEM GROUND CHECK NORMAL OPERATION.