As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE ENTERED COCKPIT WHEN PACKS SELECTED. NO SMOKE NOTED IN CABIN. APU PRESS WEAK IN SLC, JUST ENOUGH TO START ENGINES. SMOKE HAD ODD ODOR (SWEET). DE-ICED IN SLC. OPERATED RT/LT PACKS WITH APU. NO SMOKE OR ODOR NOTED. ALL PACK INDICATIONS CHECK OK.