As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AIRFRAME STARTED TO BUFFET. A VISUAL INSPECTION OF THE WINGS SHOWED THE INBOARD AILERONS FLUTTERING ABOUT TWO INCHES IN MOVEMENT ON BOTH WINGS. AIRCRAFT DUMPED FUEL AND RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED LEFT HAND AILERON BELL CRANK HINGE TRUNNION CASTING AND QUADRANT BRACKET, OPERATIONAL CHECK OK.