As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, EXCESSIVE VIBRATION WAS COMING FROM NOSE GEAR AREA AFTER GEAR RETRACTION. RECYCLED GEAR WITH SAME RESULTS. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND RIGHT NOSE GEAR DOOR OPEN. REPLACED THE RIGHT NOSE GEAR DOOR ACTUATOR, OPERATIONAL CHECK NORMAL ON GEAR CYCLE.