As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH FOR LANDING, CREW REPORTED HEARING A SOUND LIKE A SPARK FOLLOWED BY AN ELECTRICAL BURNING SMELL AND NR1 INVERTER FAILURE INDICATION. ACFT LANDED SAFELY. MAINTENANCE FOUND THE NR 1 INVERTER FAILED AND THE "AC SELECT" SWITCH MALFUNCTIONING. BOTH ITEMS WERE REPLACED.