As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS WAITING TO DEPART, WITH BOTH ENGINES RUNNING, THE HYDRAULIC PRESSURE SWITCH INTERNALLY FAILED CAUSING ALL NR 2 SYSTEM HYDRAULIC FLUID TO EMPTY INTO THE AIRCRAFT AND ONTO THE GROUND. THE FLUID ESCAPED THROUGH A RELIEF HOLE ON THE BODY OF THE SWITCH. THE NR 2 HYDRAULIC SYSTEM FLUID EMPTIED VERY RAPIDLY.