As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RDU INFLIGHT JFK TO CUN - CREW REPORTED RIGHT HYDRAULIC SYSTEM QUANTITY LOSS. LANDED RDU WITHOUT INCIDENT. FOUND HYDRAULIC LEAK AT RIGHT ENGINE HYDRAULIC PUMP RETURN LINE AND PRESSURE COUPLING. REPLACED COUPLING. SYSTEM GROUND CHECKED NORMAL OPERATION.