As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH , WHEN CREW SELECTED GEAR DOWN AND GOT 3 RED GEAR LIGHTS. REVERTED TO ALTERNATE GEAR EXTENSION AND GOT 3 GREEN LIGHTS. MAINTENANCE FOUND LOOSE WIRING CONNECTION TO THE GEAR INHIBIT SWITCH. PROBABLY WORKED ITSELF LOOSE OVER TIME WITH VIBRATION. SWITCH REPLACED AND WIRING SECURED. GEAR SWINGS CARRIED OUT AND SYSTEM FOUND SERVICEABLE.