As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - GEAR SELECTED DOWN, DOORS DIDN'T OPEN AND GEAR DIDN'T EXTEND. PERFORMED ALTERNATE GEAR EXTENSION AND GEAR EXTENDED. LANDED WITHOUT FURTHER PROBLEM. AIRCRAFT FERRIED TO PDX FOR REPAIR. REPLACED GEAR SELECTOR VALVE AND GEAR OPS CHECKED GOOD ON GEAR SWING. AIRCRAFT RETURNED TO SERVICE.