As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FIRST 20 MINUTES OF FLIGHT, AIRCRAFT EXPERIENCED TOTAL LOSS OF 'A' SYSTEM HYDRAULICS. FUEL WAS DUMPED AND AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. REPLACED OUTBOARD FLAP DRIVE MOTOR AND NR 1 AND NR 2 ENGINE DRIVE HYDRAULIC PUMPS AND CASE AND MAIN DRAIN HYDRAULIC FILTERS. LEAK AND PRESSURE CHECKED 'A' HYDRAULIC SYSTEM. CHECKED OK.