What was found
AFTER TAKEOFF, AFTER SELECTING GEAR UP. WE RECEIVED A WARNING MESSAGE GEAR DISAGREE AND NOSE DOOR OPEN. WE COMPLIED WITH THE QRH. WARNING MESSAGES CLEARED AND WE RETURNED TO FIELD LANDING WAS UNEVENTFUL. (FLT#3133) FO: 02/26/2019 CLOSED REMOVED AND REPLACED WHEEL CENTERING PROX SENSOR BRACKET, NLG SELECTOR VALVE IAW AMM. PERFORMED OPS CHECK OF LANDING GEAR IAW AMM. SWUNG GEAR SEVERAL TIMES OPS CHECK GOOD AT THIS TIME.