As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION WAS COMING FROM NOSE GEAR AREA AFTER TAKEOFF. GEAR INDICATION WAS NORMAL. RECYCLED GEAR BUT VIBRATION CONTINUED. FLIGHT RETURNED TO MDT AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND RIGHT FORWARD NOSE LANDING GEAR DOOR OPEN.