I have a 2003 range rover hse and currently have 79,600k miles. I have been informed that by law Land Rover is required to replace this part free of charge. I contated Land Rover and they stated that this rarely occurs. I been told that there is a 8yr/80k mile warranty. Any insight on this would be helpful before I cross this 80k. How do you know when you need a new one? and if it happens outside of warrenty how much would it cost for labor and materials for worst case situation.