As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, THE LANDING GEAR HAD TO BE LOWERED USING PROCEDURE C (EMERGENCY PROCEDURES). MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE NR1 LANDING GEAR UPLOCK SWITCH INOPERATIVE. REMOVED AND REPLACED UPLOCK SWITCH WITH SERVICEABLE PART. OPS CHECK OK. (K)