As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED NOSE GEAR DOORS WOULD NOT CLOSE UPON RETRACTION. SECOND ATTEMPT HAD NOSE LANDING GEAR FAILED TO RETRACT. FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NOSE LANDING GEAR STRUT PISTON THAT WAS MISSING. SYSTEM GROUND CHECK NORMAL OPERATION.