As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE SLATS WOULD NOT RETRACT AFTER TAKEOFF FROM DEN. THE SLAT HANDLE WOULD NOT GO INTO RETRACTED DETENT PAST ZERO DEGREE FLAP DETENT. RECYCLING WAS OF NO HELP. THE AIRCRAFT WAS RETURNED TO DEN WHERE IT LANDED WITHOUT INCIDENT. THE FLAP/SLAT HANDLE WAS LUBRICATED AND OPERATION CHECKED GOOD.