What was found
MSO-CABIN FILLED WITH SMOKE, PROBABLE CAUSE IS APU.REMOVED AND REPLACED APU. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
MSO-CABIN FILLED WITH SMOKE, PROBABLE CAUSE IS APU.REMOVED AND REPLACED APU. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.