As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - INFLIGHT T9646/26 SEPT - GREEN HYDRAULIC SYSTEM QUANTITY DECREASED TO AMBER AND PRESSURE WAS DECREASED BELOW LIMITS. MANUALLY EXTENDED LANDING GEAR. LANDED JFK WITHOUT INCIDENT. REPLACED GREEN SYSTEM HYDRAULIC RESERVOIR AND SUPPLY TUBE. SYSTEM GROUND CHECKED NORMAL OPERATION.