As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED A LOUD NOISE AND SIMULTANEOUS ACS PACK TURBINE HOT CAS MESSAGE ILLUMINATION WHILE RUNNING APU AND AIR CONDITIONING PACK. CREW OBSERVED SMOKE IN THE CABIN AND SHUT DOWN THE PACK AND APU. MAINTENANCE REPORTED THE AIR CYCLE MACHINE HAD FAILED, THE TURBINE IS SEIZED.