As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE, AFTER TAKEOFF AND CLIMBOUT, THE WEIGHT ON WHEELS, CAUTION LIGHT ILLUMINATED. AFTER CONSULTING THE QRH, THE CAPTAIN DECIDED TO RETURN TO BASE FOR RECTIFICATION. EXTENSIVE TESTING OF THE ACFT PROXIMITY SENSOR SYS WAS CARRIED OUT AND THE NR 2 NOSE GEAR WOW SENSOR WAS IDENTIFIED AS THE CULPRIT. SENSOR AND HARNESS WERE REPLACED, RETRACTION TESTS WERE CONDUCTED IAW THE AMM AND THE ACFT WAS RETURNED TO SERVICE.