As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PARKING, CREW REPORTED AN ELECTRICAL BURNING SMELL IN THE COCKPIT ONLY. MX INSPECTED THE ACFT AND REMOVED AND REPLACED THE OBSERVERS AUDIO CONTROL PANEL, OPS TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.