As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT T2340/30DEC, AFTER TAKEOFF UNABLE TO RETRACT NOSE GEAR. AIRCRAFT RETURNED TO DFW AND LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEAKING SCHRADER VALVE AND SERVICED NOSE GEAR. SYSTEM GROUND CHECKED NORMAL OPERATION.