There are "pipe straps" back behind the bathroom enclosure, which are basically Zip-ties, which hold the pipe in place along the wall. There are no pipe connections hidden back behind the bathroom compartment, so it is unlikely that the PEX is leaking. There's really nothing back there that would cause a problem. If you are really determined to replace that section, as to pulling the new PEX line in by coupling it to the old PEX, it may be problematic. While the old PEX can be worked out of that hidden space, adding PEX clamps to a double butt connector may cause it to hang up on something back there. Don't forget that your wiring bundle also occupies that area, so you want to be careful about not damaging any wiring or connectors. After pulling the old PEX out, I'd recommend using an electrician's snake to pull in the new pipe. It will be easier to start the new PEX pipe in from the side of the trailer under the side dinette table, and pull it in to the front from inside the front closet.
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