As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6275 - BWI-BOS - DURNG CLIMB, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO LEFT OIL COOLER FLAP WOULD NOT CLOSE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED ACTUATOR, OPS CHECK OK. AIRCRAFT WAS APPROVED AND RELEASED FOR SERVICE. (M)