As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - CREW REPORTED HYDRAULIC QUANTITY LOW INDICATION LIGHT ILLUMINATED. EMERGENCY DECLARED RETURNED TO JFK WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND RIGHT GEAR AFT BRAKE SWIVEL FITTING LEAKING. REMOVED AND REPLACED SWIVEL FITTING. SYSTEM GROUND CHECKED NORMAL OPERATION.