As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED ON THE AUXILIARY HYDRAULIC PUMP WILL NOT SHUT OFF AT PRESCRIBED LIMITS, GOES TO MAX DEFLECTION ON HYDRAULIC GAUGE. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THE HYDRAULIC PRESSURE SWITCH WAS DEFECTIVE. THE SWITCH WAS REMOVED AND REPLACED WITH A NEW SWITCH. OPS AND LEAK CHECKS WERE SATISFACTORY. THE AIRCRAFT WAS THEN RETURNED TO SERVICE.