As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: THE APU EXPERIENCED AN AUTO SHUTDOWN, RESULTING IN SMOKE IN THE CABIN. THE AFT 2 SLIDES WERE DEPLOYED ALONG WITH AN OVERWING EXIT SLIDE AND THE ACFT WAS EVACUATED. MAINTENANCE REPLACED THE APU PER TASK CARD 33L31549001 AND ACCOMPLISHED A SATISFACTORY LEAK AND OPERATIONAL CHECK WITH NO ODORS NOTED.