As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - ON FINAL APPROACH WITH GEAR AND FLAPS DOWN, HAD GEAR UNSAFE LIGHT AND HORN LEFT MAIN. WENT AROUND AND CYCLED GEAR WITH NO FURTHER INDICATIONS. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND MASKING TAPE AND DEBRIS ON LEFT MAIN GEAR DOWN LOCK PROXIMITY SWITCH. MAINTENANCE REMOVED AND CLEANED PROXIMITY SWITCH, PERFORMED BITE TEST IAW MM 32-60-04. NO FAULTS SHOWN. AIRCRAFT RETURNED TO SERVICE