Hi, the rack seals leak into the boots and then start leaking out of the boots. there is no box in this system . You can visually look at the boots of the rack and they usually swell up. Here are the steps to replace it is a pretty big job .
Hi, I would have the boots checked on the rack to verify the leak first. If it leads to the rack inner seals I would replace the whole rack. Thanks If you need more help please let me know