As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED APU AUTO SHUTDOWN AT GATE AND SMOKE ODOR IN CABIN. MAINTENANCE TROUBLESHOT AND HEARD METAL GRINDING NOISE. MAINTENANCE REMOVED AND REPLACED APU ASSEMBLY AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.