What was found
SMOKE IN CABIN AFTER ENGINE START, RETURNED TO GATE. REPLACED APU AND OPERATIONALLY CHECKED NORMAL WITH NO ODOR IN CABIN.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
SMOKE IN CABIN AFTER ENGINE START, RETURNED TO GATE. REPLACED APU AND OPERATIONALLY CHECKED NORMAL WITH NO ODOR IN CABIN.