As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EVACUATED A/C DUE TO SMOKE WHICH FILLED CABIN ON TAXI FOR DEPARTURE. FOUND FLAP MOTOR UNDER FLOORBOARD WAS BURNED, ALSO FLAP C/B WAS POPPED UNDER THE FLOORBOARD. TRIED TO TO RESET BREAKER AND OPERATE FLAPS BUT BREAKER POPPED AGAIN. REMOVED AND REPLACED FLAP MOTOR IAW 27-50-03.