Discuss this with a dealer. See what they may want to do.

I have read that some European cars do not have info about changing antifreeze or ATF because some countries require a manufacturer to state all the hazardous waste an auto may generate over its lifetime.

US dealers may not think the same.

It's not really a hard job -- easier on the T5 than the T6 as you don't need to remove the airbox. Use the Aisin fluid previously mentioned. I do 3 or 4 drain and fills of the system, over filling by about half a quart each time. On the final fill, you must have the car level, running, and monitor the trans oil temperature with VIDA or a OBD scanner until it reaches at least 50C (122F); you then removed the level set plug and allow the fluid to drain until it stops. You do not need a lift -- the job can be done with the car on the ground. Or you can use ramps or stands. Whatever it takes to level it.

If your model does not have a transmission dip stick, then it is no longer home serviceable unless you have a lift. The car must be completely level when adding ATF.

There are some DIY'ers that say you can disconnect both hoses to the radiator, use the engine to pump out 2 quarts and add 2 quarts to the return line - repeating for 12 quarts. That might work, I haven't tried it.

There isn't much room in the engine bay...

NEVER allow a shop to use a machine to pump out/flush ATF.

And yes, the automatics need a flush at around 80K miles, and 50K thereafter.
--
Keeping it running is better than buying new