As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RT HYDRAULIC SYSTEM QUANTITY DROPPED TO AS LOW AS THREE QUARTS WHILE EN ROUTE. THE AIRCRAFT LANDED AT BOS WITHOUT INCIDENT. MAINTENANCE FOUND THE HYDRAULIC LINE FOR RUDDER CONTROL SYSTEM LEAKING. THE HYDRAULIC LINE WAS REPLACED USING FLEX LINE. A DIP WAS ISSUED TO REPLACE THE FLEX LINE WITH A PERMANENT LINE WITHIN 1200 HOURS OR 500 FLIGHTS, WHICHEVER COMES FIRST. LEAK CHECK WAS GOOD.