What was found
AIR RETURN TO MSP. CREW REPORTED THE GEAR INTRANSIT LIGHT STAYED ON AND PUMP CONTINUED TO RUN WHEN GEAR WAS SELECTED UP. MAINTENANCE DUPLICATED FAULT, FOUND CONTAMINATION IN LT UPLOCK SWITCH CANNON PLUG. CLEANED PLUG AND FAULT IS GONE. SWUNG GEAR 10 TIMES, FAULT GONE, OPS CHECK GOOD. UNFASTENED AND REFASTENED LT O/B GEAR BAY DOOR FOR TOUBLESHOOTING.