As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO ORD DUE TO A LEADING EDGE FLAP PROBLEM. *S/D* POSITION NUMBER 15 LEADING EDGE SLAT ACTUATOR WAS FOUND WITH AN INTERMITTENT PROBLEM CAUSING THE EICAS MESSAGE AND LOCKOUT OF THE LEADING EDGE SLATS. REPLACED NUMBER 15 LEADING EDGE SLAT ACTUATOR AND RETURNED AIRCRAFT TO SERVICE WITH NO FURTHER PROBLEMS.