As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GROUND CHECK, THE PILOT NOTED PROBLEMS WITH FLIGHT CONTROL CHECK WITH HYDRAULICS. MAINTENANCE FOUND FERROUS DEBRIS IN THE FILTER. THE HYDRAULIC PUMP WAS REPLACED, AND SYSTEM FLUSHED. NO FURTHER DEFECTS FOUND. PUMP WAS SENT BACK TO MFG.