As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR FAILED TO FULLY RETRACT AFTER T/O FROM MKE. GEAR WAS EXTENDED, DETERMINED NO EMERGENCY EXISTED AND RETURNED FOR NORMAL LANDING. MAINTENANCE DETERMINED THE STRUT WAS UNDER INFLATED. STRUT SERVICED AND MAINTENANCE RECORDED. AIRCRAFT DEPARTED NO FURTHER PROBLEMS.