What was found
SMOKE IN CABIN WHEN APU STARTED AT GATE PRIOR TO PUSH BACK. SHUT DOWN APU SMOKE CEASED. FOUND OIL IN APU EXHAUST, APU CHANGE IN PROGRESS.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
SMOKE IN CABIN WHEN APU STARTED AT GATE PRIOR TO PUSH BACK. SHUT DOWN APU SMOKE CEASED. FOUND OIL IN APU EXHAUST, APU CHANGE IN PROGRESS.