As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW RECEIVED A RIGHT PACK HIGH TEMP CAUTION MESSAGE AND THE CABIN FILLED WITH SMOKE. MX INSPECTED THE APU COMPARTMENT AND NO DEFECTS WERE FOUND. PERFORMED AN OPS CHECK OF THE APU, OPS CHECK GOOD. RAN THE LEFT PACK OFF OF THE APU AND BOTH ENGINES AND NO SMOKE OR ODOR WERE NOTED.