As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF ROLL WITH THRUST SET WE HAD AN ECAM MESSAGE ENGINE REVERSE UNLOCKED. SPEED WAS BELOW 80 KNOTS. TAKEOFF REJECTED. LEFT HAND ENGINE LOWER INBOARD BLOCKER DOOR UNLATCHED. REPLACED BLOCKER DOOR LATCH PER AMM 78-31-19.