I done mine. glad I did it.
bought the sleeve and plug incase but didn't end up using them cause they were not leaking and I did not want to disturb them.
I used this
https://rover.ebay.com/rover/0/0/0?m...2F223287850649
6 litres used for a drain and refill.
noticed increadible difference in drive and gear changing.
and inspected pan when replacing.
found metal.
worth servicing . no such thing as lifetime fluid.