What was found
ON T/O RECEIVED GEAR DISAGREE AND NOSE DOOR OPEN WARNING MSG'S. C/W QRH LOWERED GEAR AND RETURNED TO FIELD. AFTER SELECTING HANDLE UP WARNING CAME ON IMMEDIATELY. RECEIVED INBD A-SKID AND NWS INOP MSG'S BRIEFLY. ***AIRCRAFT REMOVED FROM SERVICE*** REMOVED AND REPLACED NLG DOOR SELECTOR VALVE IAW AMM 32-22-20. OPS CHECK GOOD. REMOVED PLACARD REMOVED FROM MEL P/N: 750006000, S/N OFF: 1945, S/N ON: 0365T ARW