As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 356 - EN ROUTE PIT/CAK, CREW RECEIVED THE NR 2 HYDRAULIC SYSTEM LOW QUANTITY WARNING. CREW PERFORMED NECESSARY PROCEDURES. FLIGHT RETURNED TO PIT AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED THE NR 2 RUDDER SYSTEM MANIFOLD. (X)