What was found
(CAN) ON DEPARTURE, THE FLIGHT EXPERIENCE A "WEIGHT ON WHEELS" PROBLEM AND THE NOSE GEAR DOOR DIDN`T CLOSE. THE QRH CHECKLIST WAS FOLLOWED, SUBSEQUENT LG LEVER DISAGREE MESSAGE. THE FLIGHT RETURNED TO POINT OF DEPARTURE WITHOUT FURTHER INCIDENT. NLG SERVICED AS PER AMM 12-12-09-600-801-A. OPERATIONAL TEST OF LDG EXTENSION AND RETRACTION SYSTEM CARRIED OUT SERVICEABLE AS PER AMM 32-33-00-710-801-A. POSSIBLE P/N CAUSING ISSUE: 80-019-01 (PROX SENSOR).