As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 1598 - GSO - THE NR 4 SLAT WOULD NOT RETRACT DURING CLIMB-OUT OF GSO, THE AIRCRAFT WAS RETURNED TO GSO. MAINTENANCE FOUND THE NR 4 LEADING EDGE SLAT ACTUATOR AT FAULT. THE ACTUATOR WAS REMOVED AND REPLACED. LEAK AND OPERATIONAL CHECKS WERE GOOD. (M)