As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TOGA FOR TAKEOFF, LOST BLUE HYD SYSTEM. QTY WENT TO ZERO. REJECTED TAKEOFF,CLEARED RWY WORKED QRH. FOUND LEAK COMMING FROM BLUE SYSTEM PRESSURE TRANSMITTER AREA ON BLUE SYSTEM MODULE. LEAK IS OBVIOUS. R & R BLUE SYSTEM PRIORITY VALVE REF. A310-200 MM 29-12-12-4 AND SERVICE & OPS CHECKED REF. MM29-00-00-3. LEAK CHECKED GOOD AND OPS CHECKED NORMAL. MOTORED NR 1 ENGINE REF. JRH AND OPS CHECKED FLIGHT CONTROLS. ALL CHECKED GOOD.