As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON THE GROUND WHEN CREW TURNED PACKS ON INITIALLY THE CABIN FILLED WITH SMOKE. MAINTENANCE PERFORMED PACK BURNOUT. APU AND TAIL COMPARTMENTS WERE INSPECTED NO TROUBLE FOUND. RAN BOTH ENGINES WITH PACKS FOR 10 MINUTES AND NO SMOKE OR SMELL WAS NOTED. AIRCRAFT OK FOR SERVICE.