As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUMES IN CABIN DUE TO EHSI FAILURE. INSPECTED ELECTRICAL CONNECTOR, WIRING, AND ALL AREAS ADJACENT TO EHSI UNIT. ODOR OF ELECTRICAL BURNING WAS ISOLATED TO THE EHSI UNIT ONLY AND ALL SURROUNDING AREAS AND WIRING WERE NOT AFFECTED. DETERMINED EHSI UNIT FAILED DUE TO INTERNAL FAILURE. REMOVED AND REPLACED EHSI DISPLAY.