As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT TURNED BACK AFTER TAKEOFF. LANDING GEARS REMAIN IN THE EXTENDED POSITION AFTER LANDING GEAR SELECTOR HANDLE MOVED TO RETRACTED POSITION, WITH GREEN LIGHTS ILLUMINATED ALL THE TIME. CREW PERFORMED EMERGENCY PROCEDURE. LANDING GEAR POSITION WAS CONFIRMED FROM THE GROUND, AND AFTER THAT AC SUCCESSFULLY LANDED.