As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON T/O, ROLL LT ENG ACHIEVED ONLY 55 PERCENT N1. TAKEOFF ROLL ABORTED AT APPROX 40 KNOTS. FOUND LEFT ENGINE THRUST REVERSER RIGHT SIDE T/R L AND T/R R 26 PERCENT. ADJUSTED FEEDBACK ACTUATOR POSITION. VERIFIED L ENG REVERSER LOCKED OUT PER MEL 78-31-01 ENGINE THRUST INDICATION NORMAL.