As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED YELLOW SYSTEM LOW HYDRAULIC FLUID ENROUTE. EMERGENCY DECLARED. MAINTENANCE INSPECTED THE NR 2 ENGINE AND FOUND HYDRAULIC LEAK FROM FORWARD GASKET OF ENGINE HYDRAULIC PUMP. REPLACED THE HYDRAULIC PUMP IAW AMM 29-13-51.