As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON LANDING INTO YYZ, PILOT STARTED THE APU BUT COULD NOT GET APU GENERATOR ON LINE. MAINTENANCE NOTIFIED AND APU GENERATOR AND WIRING INSPECTED. IT WAS THEN DETERMINED THE WIRING AT THE FIREWALL DISCONNECT WAS BURNED AND CONNECTOR DAMAGED. AIRCRAFT WAS RELEASED UNDER M.E.L. 24-2 AND PARTS ORDERED FOR REPAIR.