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You can easily take the seat cover off to get to the bladders. There are zippers at the back portion and the top back portion. Just know the bladders are terribly expensive but blood pressure cuff replacement bladders are supposed to work real nice and a whole lot cheaper. I've got two child's cuff replacement bladders on order now for the side's. Adults would work for the upper and lower seat back bladders.
My side bladder, the tube broke off the bladder itself and in such a way that makes it impossible to repair. I've got the small BP cuff bladder coming Tuesday and the seat is apart waiting on it now.