As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLAP RETRACTION ON DEPARTURE, LED NR 6 REMAINED FULLY EXTENDED AFTER MOVING FLAP HANDLE FROM POSITION 2 TO ZERO. FLIGHT RETURNED TO ORD. NR 6 LEADING EDGE SLAT ACTUATOR FAILED IN THE EXTENDED POSITION. ACTUATOR WAS REPLACED AND OPERATION WAS NORMAL.