I have owned my defender for about 3 months and don't know much about it yet, so I am wanting to learn all I can about it. I am having what appears to be rear diff fluid seeping from both rear wheel hubs. Should I replace the axle seals in the diff or the hub bearings. I also have quite a few window seals that need to be replaced. Is there anything like a Chilton's or Haynes manual for Land Rover's?