As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH AND AFTER GEAR EXTENSION, THE ''A'' SYSTEM HYDRAULIC QUANTITY AND PRESSURE WENT TO ZERO. CREW FOLLOWED COM PROCEDURE AND MADE AN UNEVENTFUL LANDING. MSP MAINTENANCE REPLACED FLAP FLOW CONTROL VALVE. LEAK AND OPERATIONAL CHECK GOOD.