What was found
DFW - FLT 1171 - AFTER TAKEOFF DFW WHEN LANDING GEAR RETRACTED, NOSE LANDING GEAR DID NOT RETRACT. ACCOMPLISHED ABNORMAL PROCEDURES WITH SAME RESULTS. EXTENDED LANDING GEAR AND AIRCRAFT RETURNED TO DFW, LANDING WITHOUT INCIDENT. REPLACED NOSE LANDING GEAR RETRACTION CYLINDER AND LUBRICATED NOSE GEAR. ACCOMPLISHED NOSE LANDING GEAR RETRACTION CHECK WITH NO DEFECT FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)