As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING BOARDING THE AUXILIARY POWER UNIT FAILED CAUSING THE CABIN AND COCKPIT TO FILL WITH SMOKE. PASSENGERS WERE EVACUATED WITH NO INJURIES REPORTED. AIRCRAFT REMOVED FROM SERVICE. REPLACED AUXILIARY POWER UNIT. SYSTEM GROUND CHECK NORMAL OPERATION.