As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED RIGHT HYDRAULIC PUMP FAILED CHECK DURING RUN UP. PUMP WAS REMOVED AND IT WAS DISCOVERED THAT THE SHAFT HAD SHEARED. DURING REMOVAL OF THE FITTINGS IT WAS DISCOVERED THAT THE SMALL PRESSED IN NOZZLE, SPRING AND BALL HAD COME LOOSE WITH THE BALL JAMMING THE PUMP VANES AND CAUSING THE SHAFT TO SHEAR. NOTE: THIS WAS ON THE PRESSURE OUTLET SIDE. THE PUMP WAS REMOVED AND REPLACED.