What was found
MKE/FNT - FLT 1905 - AFTER TAKEOFF, THE FLIGHT CREW ATTEMPTED TO RETRACT THE LANDING GEAR, BUT THE DOWNLOCK RELAY DID NOT RELEASE THE LANDING GEAR SAFETY HOOK. THE CREW IMMEDIATELY TURNED BACK TO MKE AND MADE AN UNEVENTFUL LANDING. MAINTENANCE FOUND THE RT LANDING GEAR SQUAT SWITCH OUT OF ADJUSTMENT, THE SQUAT SWITCH WAS ADJUSTED, THEN THE LANDING GEAR WAS OPERATIONALLY CHECKED. WITH NO FURTHER DISCREPANCIES, THE AIRCRAFT WAS RETURNED TO SERVICE. (X)