As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT FROM LAS, LEADING EDGE SLATS WOULD NOT RETRACT. FLIGHT CREW ELECTED TO RETURN TO LAS FOR A NORMAL LANDING, NO EMERGENCY PROCEDURE WAS PERFORMED. MAINTENANCE DEPARTMENT PERSONNEL INSPECTED AND FOUND THE FLAP/SLAT LOCK OUT BUTTON STICKY. THE BUTTON WAS CLEANED PER MM 27-50-00. SYSTEM OPERATION PERFORMED NORMAL. AIRCRAFT WAS RETURNED TO SERVICE.