What was found
ON GROUND, AFTER APU START BEFORE FLIGHT, CREW NOTED SMOKE IN CABIN. SMOKE WAS EMANATING FROM CABIN AIR VENTS. MX FOUND THE CABIN AIR CYCLE MACHINE FAILED. THE UNIT WAS REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ON GROUND, AFTER APU START BEFORE FLIGHT, CREW NOTED SMOKE IN CABIN. SMOKE WAS EMANATING FROM CABIN AIR VENTS. MX FOUND THE CABIN AIR CYCLE MACHINE FAILED. THE UNIT WAS REPLACED.