As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXCESSIVE VIBRATION FROM NOSE GEAR AREA OCCURRED AFTER GEAR RETRACTION. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND RIGHT NOSE GEAR DOOR UNLATCHED. CLEANED ICE AND SAND FROM ACTUATOR LATCHING ARM. OPERATIONAL CHECK NORMAL ON SEVERAL DOOR CYCLES. AIRCRAFT RETURNED TO SERVICE.