Would like to know if there is a lay out drawing on the hydraulic lines for the jacks on my 2015 BH 3570RS. One line has a slow leak on the center jack under the kitchen. would like to know where the line runs so I can replace it
Let's assume your pump is on the off-door side. To get a hose to the door side, the hose has to cross the underbelly either in front of the gray #1 and black holding tanks, or to the rear of the tanks.
On our LM, I'm pretty sure the hose to the door side rear (4 point) jack crosses to that side under the front bedroom and then runs down the frame. You could remove a few of the screws holding the front drop-frame section of the coroplast to see if that's the case on your Bighorn. If so, you could just let one side of the front section of coroplast hang down to work on the hose.
Btw, an impact wrench is pretty essential for removing the screws holding the coroplast. You can do it with a ratchet, but it's much harder and you may end up wrenching the head of one or more screws.