What was found
DFW - FLT 1116 - AFTER TAKEOFF DFW WHEN LANDING GEAR RETRACTED, NLG FAILED TO RETRACT. AIRCRAFT RETURNED TO DFW AND LANDED WITHOUT INCIDENT. REPLACED NLG STRUT INNER CYLINDER. ALSO, REPLACED NLG RETRACTION ACTUATOR. SERVICED NLG STRUT WITH OIL AND NITROGEN. ACCOMPLISHED LEAK AND GROUND CHECKS WITH NO DEFECTS FOUND. ACCOMPLISHED FUNCTIONAL CHECK FLIGHT WITH NO DEFECTS FOUND. SYSTEM OPERATIONAL CHECKED NORMAL. (X)