As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER ROTATION THE FLIGHT CREW WERE NOT ABLE TO RETRACT NLG. THEY RETURNED TO AIRPORT OF DEPARTURE AND AS A PRECAUTIONARY MEASURE PERFORMED AN ALTERNATE EXTENSION AND LANDED WITHOUT INCIDENT. NO EMERGENCY WAS DECLARED. AT THE GATE THE CREW NOTED DAMAGE TO THE GEAR DOORS. OPERATOR FERRIED THE ACFT BACK FOR REPAIRS USING SL DH8-4-SL-32-001B AS THERE AUTHORITY.