As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORT ON APPROACH WHEN THE EXTERIOR LIGHTS WERE TURNED ON THERE WAS AN ODOR LIKE NAIL POLISH OR SOME KIND OF CHEMICAL ODOR. ACFT LANDED WITHOUT INCIDENT AND MAINTENANCE WAS CONTACTED AND DISPATCHED. THEY FOUND THE LT ESSENTIAL BUS TIE SWITCH HAD HEAT DAMAGE IN THE PLASTIC SHELL WAS CRACKED WHERE THE WIRES CONNECT TO IT. SWITCH WAS REPLACED AND THE ACFT RETURNED TO SERVICE.