As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH WHEN LANDING GEAR SELECTED DOWN, HAD 3 RED LANDING GEAR UNSAFE LIGHTS AND A LANDING GEAR HANDLE DISAGREEMENT LIGHT. PERFORMED AND ALTERNATE EXTENSION OF THE LANDING GEAR, AND ACCOMPLISHED A UNEVENTFUL LANDING. REPLACED THE PROXMITY SENSOR ELECTRONIC UNIT, OPERATIONAL CHECKS GOOD.