Theres a diy on it here I changed the diff fluids in my 4 mo today and took pictures.
ECS offer a supply kit Volkswagen R32 MKIV 3.2 > Maintenance > Drivetrain > ES#7998 Haldex Service Kit With Tool - 02D598558. I've never done the job but I believe you need that specific spanner for it. Not sure where you'd find it in aus though.
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