What was found
DFW - FLT 774 - AFTER TAKEOFF MTY, NOSE LANDING GEAR MESSAGE APPEARED. RECYCLED LANDING GEAR WITH SAME RESULTS. VISUALLY CONFIRMED NOSE LANDING GEAR RETRACTED BUT DOORS WERE OPEN. CLIMBING THROUGH FL 180, NOSE LANDING GEAR DOORS CLOSED AND ALL INDICATIONS RETURNED TO NORMAL. AIRCRAFT PROCEEDED TO DFW AND LANDED WITHOUT INCIDENT. REPLACED NOSE LANDING GEAR SEQUENCE VALVE AND FLOW RESTRICTOR. ACCOMPLISHED LANDING GEAR RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)