As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE FROM MKE THE LANDING GEAR UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION. THE CREW RETURNED TO MKE. LANDING WAS UNEVENTFUL. TROUBLESHOOTING BY MAINTENANCE FOUND THE RIGHT SQUAT SWITCH OUT OF ADJUSTMENT. ADJUSTED SQUAT SWITCH. OPS CHECK GOOD.