As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLT CREW REPORTED THAT THE NLG WOULD NOT EXTEND DURING APPROACH. QRH FOLLOWED, ALTERNATE EXTENSION CARRIED OUT AND THE ACFT LANDED WITHOUT FURTHER INCIDENT. THE ACFT WAS FERRIED TO GEAR DOWN FOR FURTHER TROUBLESHOOTING. MX FOUND THE NLG SELECTOR VALVE TO BE INOP. NLG SELECTOR VALVE R&R AND OPS CHECKED SERVICEABLE. ACFT RETURNED TO SERVICE. 7779/6223 (VALVE TIMES)