As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - EN ROUTE DTW-DFW COULD NOT RETRACT LANDING GEAR. HANDLE STOPPED HALF-WAY UP. RETURNED DTW AND LANDED WITHOUT INCIDENT. OPERATED GEAR HANDLE SEVERAL TIMES AND SWUNG NOSE GEAR SEVERAL TIMES. SERVICED NOSE GEAR WITH 5606 AND NITROGEN. SYSTEM GROUND CHECKED NORMAL OPERATION.