Does my daughter's Mercedes-Benz 350 CLK really need its transmission fluid replaced?

My daughter has a 2006 Mercedes-Benz 350 CLK auto with relatively low mileage. It's time for its £355 annual service from the main dealer, who has also recommended a transmission fluid check/replacement at a further £335. Whilst it is probably a good idea, the price seems extortionate to me. What do you think? Is it essential or is the dealer looking for straight work? Should she seek out a Fedauto specialist that you have often recommended to do this work?
Less than 10 per cent of the price of a new transmission. Now that autoboxes have six, seven or eight speeds they need regular transmission fluid changes, and this needs to be done by a dialysis process at precisely the right temperature and pressure. That's why it's so expensive. But a member of can probably do it more cheaply.
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