What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKE-OFF DUE TO GROUND SHIFT FAILURE. FLIGHT CONTINUED TO DESTINATION (MSP) AND LANDED WITHOUT INCIDENT. NOTE: EMERGENCY EQUIPMENT WAS CALLED OUT AS A PRECAUTIONARY MEASURE. CYCLED GEAR SEVERAL TIMES. ALL CHECKED NORMAL. WASHED GEAR DUE TO HEAVY GRIT AND SERVICE NOSE GEAR STRUT TO PROPER LEVELS. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.