As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION FROM NOSE GEAR AREA OCCURRED ON GEAR RETRACTION AFTER TAKEOFF. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND RIGHT NOSE GEAR DOOR OPEN AND ACTUATOR LOOSE. REPLACED ACTUATOR. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.