As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF FROM BRUSSELS (BRU), A-SYSTEM HYDRAULIC QUANTITY WENT TO 2.0 GALLONS AND LOW LEVEL LIGHT ILLUMINATED. RETURNED FOR LANDING TO (BRU). GENERATED FROM PILOT REPORT. REMOVED AND REPLACED LEFT MAIN LANDING GEAR DOOR ACTUATOR IAW MM CHAPTER 32. OPS CHECK GOOD. (X)