As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNED ELECTRICAL SMELL FROM F/O SIDE PANEL. MAINTENANCE INSPECTED AND FOUND THE HEAT SOURCE TO BE FROM THE APU FEEDER PROTECTION RELAY. WITH THE APU OFF THERE WERE NO SIGNS OF HEAT OR SMOKE. APU FEEDER PROTECTION RELAY REPLACED. OPS CHECK GOOD. (M)