What was found
(CAN) ON CLIMBOUT, DURING GEAR RETRACTION THE CREW GOT A GEAR DISAGREE MSG AND THE GEAR DID NOT RETRACT. THE CREW ACTIONED THE QRH AND THE GEAR WAS PUT DOWN IN THE LOCKED POSITION WITH 3 GREEN. AFTER TALKING TO MAINTENANCE, THE CREW TRIED TO RETRACT THE GEAR AGAIN, HOWEVER, IT DID NOT RETRACT. THE ACFT RETURNED TO DEPARTURE POINT WHERE IT LANDED WITHOUT ANY FURTHER ISSUE. MAINTENANCE RESOLUTION: NLG CENTERING PROXIMITY SENSORS PX08 AND PX37 WERE FOUND OUT OF RIG. THE SENSORS WERE ADJUSTED AND GEARS SWINGS WERE CARRIED OUT. CHECKED SERVICEABLE.