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To the best of my knowledge to get to the clutch packs you need to remove the gearset and so you need to remove the brake band pistons and the brake bands. I base this information on my knowledge of the 722.1 transmission - I haven't taken my 722.3 to bits yet but I've got a feeling it needs to be done the same way.
Have a look through the manual.
Whilst it might be possible to remove the first clutch pack insitu (is that the K1? Probably - I can't remember...) you need to be careful with this sort of thing 'cos you have to make sure that the clearance of the gearset (distances between certain components) is correct otherwise you'll end up with bearing / wear problems. To do these measurements on the 722.1 the gearset has to be removed - I'm not sure about the 722.3 => again I'm sorry to say it is probably best to read the manual...
...if you go for a partial removal of the gearset make sure you don't damage the brake bands. They are very expensive (for what they are) to replace. They're coated with a paper based material.
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