As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - CREW REPORTED RIGHT HYDRAULIC SYSTEM QUANTITY LOW MESSAGE. EMERGENCY DECLARED, RETURNED TO JFK LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED RIGHT ENGINE DRIVEN HYDRAULIC PUMP AND RETURN FILTER. SYSTEM GROUND CHECKED NORMAL OPERATION.