As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXCESSIVE NOISE AND VIBRATION WAS COMING FROM NOSE GEAR AREA AFTER GEAR RETRACTION ON DEPARTURE. RECYCLED GEAR WITH SAME RESULTS. FLIGHT RETURNED TO MCI AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND LEFT NOSE GEAR DOOR OPEN. SECURED GEAR DOORS.