What was found
BTV---CO4069, CREW REPORTED WHILE TAXING OUT THAT THE APU FAILED AND FILLED THE CABIN WITH SMOKE. AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND FOUND FAULTY APU, PLACED APU ON MEL AND RETURNED AIRCRAFT TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BTV---CO4069, CREW REPORTED WHILE TAXING OUT THAT THE APU FAILED AND FILLED THE CABIN WITH SMOKE. AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND FOUND FAULTY APU, PLACED APU ON MEL AND RETURNED AIRCRAFT TO SERVICE.