What was found
WHILE ENROUTE, THE FLIGHT DIVERTED TO MEM FOLLOWING THE "RT HYDRAULIC LOW" MESSAGE ILLUMINATING ALONG WITH THE RT HYDRAULIC QUANTITY RAPID DECREASING TO 2 QUARTS. COMPLETED CHECKLIST. NOTE: F/A REPORTED LOUD NOISE DURING CLIMBOUT BUT NO INDICATIONS OF ANY PROBLEMS UNTIL PASSING FL240. FOUND RT HYDRAULIC SYSTEM PRESSURE LINE FORWARD OF HYDRAULIC FILTER TO THE CHECK VALVE OF THE RUDDER SHUTOFF VALVE TO BE BROKEN. INSTALLED A TEMPORARY FLEXIBLE HOSE REPAIR IAW AMM 20-12-04. REINSPECTION REQUIRED W/I 175F HRS AND REPLACEMENT REQUIRED W/I 350F HRS. ENGINE RUN AND LEAK CHECK OK.