What was found
DFW - FLT 851 - AFTER TAKEOFF STL WHEN LANDING GEAR RETRACTED, NOSE LANDING GEAR MESSAGE APPEARED ON MFDU WITH AIR NOISES INDICATING NOSE LANDING GEAR DOORS WERE OPEN. RECYCLED LANDING GEAR AND ALL INDICATIONS RETURNED TO NORMAL WITH NO AIR NOISE. AIRCRAFT PROCEEDED TO DFW AND LANDED WITHOUT INCIDENT. REPLACED NOSE LANDING GEAR SEQUENCE VALVE AND ROD ASSEMBLY. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)