As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT DEPARTED DTW AND ON CLIMB-OUT, THE LANDING GEAR HANDLE WOULD NOT MOVE TO THE RETRACT POSITION. THE AIRCRAFT RETURNED TO DTW AND MAINTENANCE WAS UNABLE TO DUPLICATE. GALLING WAS DETECTED IN THE CHROME SECTION OF THE STRUT ASSY AND THE UNIT WAS SENT BACK TO WICHITA FOR EVALUATION.