As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, THE LANDING FAILED TO EXTEND WHEN SELECTED DOWN. THE CREW PERFORMED AN ALTERNATE GEAR EXTENSION AND THE ACFT LANDED WITHOUT FURTHER INCIDENT. MX DETERMINED THAT THE GEAR SELECTOR VALVE EXTENSION PORT SOLENOID WAS AT FAULT. THE SELECTOR VALVE WAS REPLACED, TESTED SERVICEABLE AND THE ACFT RETURNED INTO SERVICE.