What was found
SHORTLY AFTER LEVEL OFF, RECEIVED "HYD 3 ELEV OFF" WARNING, FLUID AT 4.9 CONTINUED TO SLOWLY LEAK, RECEIVED HYD 3 OFF 20 MINUTES LATER. FLUID TRAPPED AT 2.9. AFTER GEAR EXTENSION, RECEIVED "HYD 3 FAIL" FLUID DROPPED TO 1.2. SHUTDOWN 1 & 3 ENG, TOWED TO PARK. (FLUID 0.7) NEEDED ENG 2, NO APU. USED MANUAL GEAR EXTENSION ON SHORT FINAL. FOUND RT BRAKE MANIFOLD VLV LEAKING. REMOVED RT MANIFOLD IAW AMM 32-44-05-2 UP TO ITEM 3A(7).