As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE BLEED IN AUTO AND PACKS IN LOW, SMOKE BEGAN FILLING CABIN. SMOKE STOPPED AFTER SELECTING ENGINE BLEEDS TO LOW. RAN BOTH ENGINES WITH BLEED IN AUTO MODE. NO DEFECTS NOTED. ANY POWER SETTING, COULD NOT DUPLICATE DISCREPANCY ON THE GROUND.