A little advise please. I've got a MY2008 (facelift) S3. The last few weeks its developed a hissing noise noise from the drivers footwell whenever I am NOT breaking. After a bit of an inspection and reading up I've worked out that the servo must be leaking. I've done a few tests on the servo and it seems to be operating correctly. However the noise is really doing my head in and although the servo seems to fine now I don't really want to risk it failing one day. So I've decided to change the servo myself, I am a competent engineer and I'm not paying the huge price for a garage to do it. Has anyone done this before or know of a guide? Any specialist tools required? I appreciate that the engine needs to come forwards to get enough space. Will have to remove the engine from the gearbox? Or the drive shafts from the gearbox to get enough movement in the engine? Any advice would be greatly appreciated.