As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT AFTER LANDING GEAR RETRACTION, THE YELLOW HYDRAULIC SYSTEM FLUID QUANTITY DECREASED TO ZERO. AIRCRAFT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE YELLOW HYDRAULIC SYSTEM GROUND SERVICED MANIFOLD (3146GM). LEAK AND OPERATIONAL CHECK OK.