As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) GEAR DID NOT EXTEND WHEN GEAR HANDLE SELECTED DOWN. 3 RED LIGHTS ILLUMINATED, NO OTHERS ILLUMINATED. PERFORMED ALTERNATE GEAR EXTENSION PER E/A CHECKLIST PROCEDURE. GEAR EXTENDED OK. MX PERFORMED RESISTANCE CHECK AT LANDING GEAR SELECTOR VALVE AND FOUND HIGH RESISTANCE AT EXTEND CONTACTS. REPLACED LANDING GEAR SELECTOR VALVE. (TC 20100209009)