As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6303 - IAD-DAY - DURING TAXI, AIRCRAFT RETURNED TO GATE DUE TO LEFT OIL COOLER FLAP STUCK OPEN. MAINTENANCE INSPECTED AND REMOVED AND REPLACED LEFT OIL COOLER FLAP ACTUATOR AND BUSHINGS, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)