As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) APU WAS BELCHING OUT SMOKE AND FLAMES. APU OIL LEVEL SHOWED NO INDICATION. APU SHUTDOWN BY FLIGHT CREW. MAINTENANCE INSPECTED TURBINE AND EXTERIOR OF APU PLUS AIRCRAFT STRUCTURE FOR ANY SIGNS OF DAMAGE. NO DEFECTS WERE FOUND. APU SERVICED WITH 8L OF OIL. ONE START ATTEMPT WAS CARRIED OUT WITH THE SAME RESULTS. AFTER 15 SECONDS OIL LEVEL DROPPED 2L.