As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH DURING GEAR EXTENSION OBSERVED 3 RED INDICATIONS FOR LANDING GEAR DOWN AND LOCKED. HANDLE SELECTED UP AND 3 RED LIGHTS EXTINGUISHED RIGHT AWAY. PERFORMED ALTERNATE EXTENSION OF LANDING GEAR. REPLACED LANDING GEAR SELECTOR VALVE. FUNCTIONAL CHECK OF LANDING GEAR GOOD, NO LEAKS NOTED.