As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - FLT 21 - EN ROUTE JFK-LAX - DETECTED LOSS OF CENTER HYDRAULIC SYSTEM FLUID. RETURNED JFK AND LANDED WITHOUT FURTHER INCIDENT. REPLACED RIGHT CENTER PRESSURE FILTER BOWL MODULE. LEAK CHECKS GOOD. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)