As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON APU FAILURE, SMOKE ODOR FILLED THE CABIN AND COCKPIT. MAINTENANCE INSPECTED THE APU BAY AND FOUND NO LEAKS. APU WAS RUN FOR 10 MINUTES WITH AND WITHOUT BLEEDS ON. NO DEFECTS WERE NOTED AND NO ODORS WERE DETECTED. AIRCRAFT WAS THEN RELEASED FOR SERVICE.