What was found
PDX-SUP-WHILE AIRCRAFT WAS SITTING AT GATE WITH APU RUNNING CABIN FILLED WITH SMOKE.AIRCRAFT RETURNED TO SERVICE. 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.
PDX-SUP-WHILE AIRCRAFT WAS SITTING AT GATE WITH APU RUNNING CABIN FILLED WITH SMOKE.AIRCRAFT RETURNED TO SERVICE. REMOVED AND REPLACED APU. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.