As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING VISUAL APPROACH, THE CREW RECEIVED A MASTER WARNING LANDING GEAR NOT DOWN ON CAP AND 1 RT UNLOCK LIGHT ON OVERHEAD PANEL. INITIATED A GO AROUND, CYCLED THE GEAR 3 TIMES AND RAN THE EMERGENCY LANDING GEAR EXTENSION CHECKLIST. LANDED WITH OUT INCIDENT. MAINTENANCE FOUND THE MLG PROXIMITY SWITCH RT (10GB) WIRING DAMAGED. REPLACED THE SWITCH. CHECKED GOOD.