As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAKEOFF, ALL LANDING GEAR DID NOT RETRACT. GEAR REMAINED EXTENDED AND THE AIRCRAFT LANDED NORMALLY. MAINTENANCE TESTED LANDING GEAR OPERATION AND THE FAULT COULD NOT BE REPRODUCED. DIN01A AND DIN02A CODES WERE RECORDED BY THE PSEU. THE LANDING GEAR SELECTOR CONTROL UNIT WAS REPLACED AND GEAR SWINGS COMPLETED WITH NO FAULTS. THE AIRCRAFT WAS SUBSEQUENTLY RELEASED FOR SERVICE.