As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIGHT SMOKE IN FLIGHT DECK, CABIN AND BAG BAY IN FLIGHT AT 19,000 FT COMPLIED WITH UNKNOWN SMOKE CHECKLIST, RECIRCULATION FAN AND BLEEDS SELECTED OFF. AFTER BLEEDS OFF, SMOKE DISSIPATED. R & R AIR SWITCHING VALVE IAW MM 72-30-00. GROUND RAN ACFT WITH BLEEDS ON. NO DEFECTS NOTED. NO SMOKE ODOR NOTED.