What was found
AFTER DEPARTURE, THE NOSE WHEEL DID NOT RETRACT AND WE GOT A GEAR DISAGREE MESSAGE. THE LEFT AND RIGHT MAIN INDICATION SHOWED UP AND NORMAL. THE FLIGHT CREW RAN THE CORRECT QRH PROCEDURE, AND THE NOSE WHEEL WAS ABLE TO COME TO A DOWN THREE GREEN INDICATION. AFTER DOING A LOW PASS OVER THE AIRPORT, THE TOWER CONTROLLER WAS ABLE TO CONFIRM THAT ALL THREE LANDING GEAR WERE VISUALLY SHOWING DOWN. WE THEN RETURNED TO AIRPORT FOR A LANDING, AND THE AIRPLANE LANDED SAFELY AND NORMALLY. (FLT#3537) CLOSED PERFORMED ADJUSTMENT TO BOTH NLG DOWN LOCK SENSORS AND UPLOCK SENSOR PX 22, IAW AMM. OPS CHECKS GOOD.