As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAKEOFF, WHEN THE GEAR HANDLE WAS SELECTED TO THE UP POSITION, ALL 3 GREEN GEAR LIGHTS REMAINED ILLUMINATED AND THE GEARS DID NOT RETRACT. THE CREW CARRIED OUT AN AIR TURN BACK AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND A DEFECTIVE MICROSWITCH FOR THE MANUAL EXTENSION ACCESS DOOR. THE SWITCH WAS REPLACED, AND A GEAR SWING WAS CARRIED OUT WITH NO FAULTS.