You can follow the cables thru the rear bulkhead in the garage. Take out the panels and you probably can r&r the cable from there. Re rout the cables like in my picture by removing some of the bulkhead behind the convenience cover to take the strain and bends out of the cable. I did replace my valves also with Valtera and for that you will need to peel back the chloroplast.
http://www.montanaowners.com/forums/...&pictureid=215