What was found
2.5 HOURS INTO FLIGHT, RECEIVED A HYD 3 ELEVATOR OFF, NR 2-3 RMP ALERT. AFTER COORDINATION WITH MOCC, ISOLATED THE NR 3 HYD SYSTEM, FLUID LEVEL CONTINUED TO DECREASE TO 1.7 GALLONS DURING DESCENT. FOLLOWED HYD 3 FAIL CHECKLIST, USED A MANUAL GEAR EXTENSION PROCEDURES. AT SHUTDOWN THE NR 3 HYDRAULIC RESERVOIR HAD 0.2 . FOUND THE NR 6 BRAKE, AFT BRAKE LINE CUT 4 INCHES ABOVE BRAKE, REPLACED THE BRAKE LINE. REPLENISHED THE NR 3 HYD SYSTEM. OPS AND LEAK CHECKED OK.