As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1618 - AFTER TAKEOFF DFW WHEN LANDING GEAR RETRACTED, UNABLE TO RETRACT NOSE LANDING GEAR. AIRCRAFT RETURNED TO DFW AND LANDED WITHOUT INCIDENT. REPLACED NOSE LANDING GEAR DOOR SELECTOR VALVE AND VALVE RESTRICTOR. ACCOMPLISHED LANDING GEAR RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM LEAK AND GROUND CHECKED NORMAL OPERATION. (M)