What was found
WITH APU RUNNING AND BLEED AIR ON WE NOTICED LIGHT SMOKE OR VAPOR IN CABIN AND A MUSTY ODOR. TURNED BLEED AIR OFF AND SMOKE/VAPOR SEEMED TO GET WORST. SHUTDOWN APU AND STARTED ENGINES AND SMOKE/VAPOR WENT AWAY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WITH APU RUNNING AND BLEED AIR ON WE NOTICED LIGHT SMOKE OR VAPOR IN CABIN AND A MUSTY ODOR. TURNED BLEED AIR OFF AND SMOKE/VAPOR SEEMED TO GET WORST. SHUTDOWN APU AND STARTED ENGINES AND SMOKE/VAPOR WENT AWAY.