What was found
WHILE APU WAS OPERATING AND AC PACKS IN OPERATION, THE CABIN BEGAN TO FILL WITH SMOKE. SEVERAL SECONDS LATER THE APU AUTO-SHUTDOWN OCCURRED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE APU WAS OPERATING AND AC PACKS IN OPERATION, THE CABIN BEGAN TO FILL WITH SMOKE. SEVERAL SECONDS LATER THE APU AUTO-SHUTDOWN OCCURRED.