As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE MSP-LAX, THE LEFT HYDRAULIC SYSTEM QUANTITY AND PRESSURE BEGAN DECREASING. THE FLIGHT DIVERTED TO DEN AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LEFT ENGINE DRIVEN PUMP DEFECTIVE. THE LEFT ENGINE DRIVEN PUMP WAS REPLACED WITH A SERVICEABLE UNIT.