What was found
DFW - FLT T1098 - AFTER TAKEOFF DFW WHEN LANDING GEAR RETRACTED, NOSE LANDING GEAR DID NOT RETRACT. AIRCRAFT RETURNED TO DFW AND LANDED WITHOUT INCIDENT. REPLACED NOSE LANDING GEAR DOOR SELECTOR VALVE. ACCOMPLISHED NLG RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)