What was found
AFTER TAKEOFF FROM MSP UPON GEAR RETRACTION, NOSE LANDING GEAR UNSAFE LIGHT REMAINED ILLUMINATED. CREW FOLLOWED COCKPIT OPERATING MANUAL PROCEDURE AND RECYCLED GEAR. INDICATION WAS NORMAL AFTER WAS RECYCLED. FLIGHT CONTINUED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE CHECKED RIG OF GEAR, SENSOR, AND PERFORMED BITE TEST OF PROXIMITY BOX. CYCLED GEAR SEVERAL TIMES. OPERATIONAL CHECK OK.