As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED AFTER TAKEOFF LANDING GEAR HANDLE WOULD NOT RETRACT. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NOSE LANDING GEAR STRUT PISTON THAT WAS DAMAGED. SYSTEM GROUND CHECK NORMAL OPERATION.