As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT COCKPIT FILLED WITH SMOKE ON TAXI OUT. CREW SHUT OFF ECS AND BLEED AIR VALVES. SMOKE STOPPED ENTERING THE COCKPIT. MAINTENANCE REPLACED A DEFECTIVE AFT CABIN, FORWARD EVAPORATOR BLOWER ASSEMBLY. AIRCRAFT WAS RETURNED TO SERVICE.