As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKOFF THE LANDING GEAR WOULD NOT RETRACT. AIRCRAFT RETURNED TO BASE. MAINTENANCE DISCOVERED THAT THE RIGHT HAND WIRING CONECTOR IN THE WHEEL WELL WAS DIRTY AND PREVENTED THE PROPER INDICATION TO ALLOW THE LANDING GEAR TO BE RETRACTED. THE CONNECTOR WAS CLEANED AND CHECKED FOR SEALING. THREE GEAR SWING COMPLETED AND CHECKED SERVICABLE