As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT FROM AFW TO YYZ, AFTER LANDING MECHANIC DURING POST FLIGHT INSPECTION DISCOVERED THAT THE S51MT (ATA 57 - INBOARD WING TRAINING EDGE) PANEL HAD PARTIALLY DEPARTED THE AIRCRAFT. APPEARS THE PANEL FASTENERS WERE NOT PROPERLY INSTALLED.