Volvo itself does acknowledge the need to change the ATF, but only in cases of 'arduous operations', as it terms it (hot, dusty, taxis, towing - I may have made one of those up, but you get the drift), and IIRC on a remarkably short cycle like 24K miles.
...and yet says nothings required for normal operation, which is simply nonsense, as evidenced by the majority of other marques which use the AW55 'box. So yes, do it.
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