As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED LANDING GEAR UNSAFE INDICATION. EMERGENCY EXTENSION WAS USED AND GEAR EXTENDED NORMALLY. EMERGENCY DECLARED LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND LANDING GEAR HANDLE WAS JAMMED. REPLACED LANDING GEAR CONTROL VALVE AND COMPLETED FUNCTIONAL FLIGHT CHECK. SYSTEM GROUND CHECKED NORMAL OPERATION.