As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPERATION AN AIR CONTROL PANEL FAILED AND SEPARATED FROM THE AIRCRAFT. THE AIR CONTROL PANEL FAILED BEHIND THE NUMBER 4 NACELLE. DUE TO THE FAILURE OF THE AIR CONTROL PANEL, THE TAILING EDGE SKIN IMMEDIATELY ABOVE THE AIR CONTROL PANEL ENCOUNTERED AN INSTANTANEOUS INCREASE IN AERODYNAMIC LOAD AND CAUSED A SHORT CRACK TO FORM. THE GENERAL LOCATION OF THE DAMAGE IS ON THE LOWER WING TRAILING EDGE BETWEEN FLAP STA 258-300.