What was found
IMMEDIATELY AFTER ENGINE START WHEN PACKS WERE SWITCHED ON, SMOKE BECAME VISIBLE IN CABIN.REMOVED AND REPLACED LEFT GROUND COOLING FAN WITH A SERVICEABLE UNIT IAW MM 21-51-03.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
IMMEDIATELY AFTER ENGINE START WHEN PACKS WERE SWITCHED ON, SMOKE BECAME VISIBLE IN CABIN.REMOVED AND REPLACED LEFT GROUND COOLING FAN WITH A SERVICEABLE UNIT IAW MM 21-51-03.