As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST SYSTEM 'A' HYDRAULIC QUANTITY AND PRESSURE AFTER START OF TAXI. REPLACED OUTBOARD FLAP HYDRAULIC FLOW LIMITING VALVE DUE TO LEAKING. INSPECTED HYD FILTERS, NO METAL FOUND. SERVICED HYD SYSTEM. OPERATED ALL FLIGHT CONTROLS AND CYCLED GEAR HANDLE WITH GEARS PINNED. OPERATED NR 1 AND NR 2 ENGINES. ALL INDICATIONS NORMAL. NO LEAKS.