The accumulators are under one of the floor panels in the back. If you put the third seat flat, as if you were about to use the entire back for hauling something, embedded in the carpet are two chrome-headed philips screws. You can leave the second seat fully upright in its position. It's just behind the second/back seat. Two screws that are (about maybe three-feet apart) in the carpet. Unscrew those, lift the panel up, and you will see the black spheres. I replaced mine last fall. They are a bear to undo from the bottom too. It's definitely doable-it's just messy.