As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL, RECEIVED HYD YELLOW RESERVOIR LOW LEVEL MESSAGE. TAKEOFF WAS ABORTED AT APPROXIMATELY 50 KNOTS. MAINTENANCE TIGHTENED LOOSE B-NUT ON THE YELLOW SYSTEM ACCUMULATOR. SERVICED YELLOW HYDRAULIC SYSTEM TO FULL. LEAK AND OPERATIONAL CHECK OK.