As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYZ-DURING MOD-LINE INSPECTION, THE FORWARD CENTER BUTTSTRAP WAS FOUND TO BE CORRODED. MAINTENANCE REMOVED THE CORROSION AND INSTALLED A REPAIR DOUBLER IN ACCORDANCE WITH CONTINENTAL EXPRESS ENGINEERING CHANGE EC5310-01107, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.