As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFT CARGO DOOR OPEN MESSAGE ON TAKEOFF ROLL. TAKEOFF ABORTED AND AIRCRAFT RETURNED TO GATE. DOOR CONFIRMED CLOSED BY MAINTENANCE CREW AND DEFERRED AS PER MEL. SUBSEQUENT MAINTENANCE ACTION REPLACED AFT CARGO DOOR HANDLE MECHANISM LEVER.