As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - CREW REPORTED ON DESCENT WHEN HYDRAULICS PUMPS TURNED TO HIGH, LEFT SYSTEM QUANTIY WENT TO ZERO. FLIGHT LANDED DEN WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT RESERVOIR AND SPOILER MANUAL SHUTOFF VALVE (MPN 1474253) THAT WERE LEAKING. SYSTEM GROUND CHECK NORMAL OPERATION.