What was found
(CAN) AIRCRAFT RETURNED TO GATE DUE TO SMOKE IN CABIN AND FLIGHT DECK. CAUSE FOUND TO BE COMING FROM AIR CONDITIONING UNIT WHEN APU BLEED AIR USED. APU REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) AIRCRAFT RETURNED TO GATE DUE TO SMOKE IN CABIN AND FLIGHT DECK. CAUSE FOUND TO BE COMING FROM AIR CONDITIONING UNIT WHEN APU BLEED AIR USED. APU REPLACED.