As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN ESTABLISHING EXTERNAL POWER VENT EXTRACT FAULT MESSAGE CAME ON ELECTRONIC CENTRALIZED AIRCRAFT SYSTEM FOLLOWED BY ACRID SMELL. EXTRACT FAN OVERHEAT RESET, OPERATION NORMAL, OVERBOARD VALVE RETURNED TO NORMAL. REPLACED EXTRACT FAN ASSEMBLY AND OPERATION NORMAL.