I'm thinking while I'm typing. Assuming it goes thru under the floor rather than in cabinets, the three spots that would be problematic would likely be where it goes thru the floor at the refrigerator end and at the filter end, and where it goes thru the flexible connection to the slide. You should be able to remove the ceiling panel between the frame rails to get to that part of the route. I wonder if you could cut a piece of "O" ring and maybe superglue it into one end of the bad line and into one end of the new one. Then you might be able to push from the feed end and pull from the bad end and tug it through that way. You would certainly have to help it at those penetrations and any restriction point.
If the routing is above the floor, you will find that all of the bottoms of the cabinets can be easily removed to get access to the space below them. And drawers can be pulled to accomplish the same goal.
I'm assuming you have a Monaco product, and I'm assuming it was made in the last decade or two. You don't say. But if those things are true, you should be able to get the job done. On our '06 Monaco, they ran ½" PEX to near the refrigerator. I haven't seen the transition piece, yet. It is PEX where it turns vertical below the back of the fridge. Where it emerges at the fridge, it is well wrapped in insulation. I suspect that is where the PEX ends and transitions to a short piece of flexible line to the water valve.
May have been a help, may not. Good luck in your efforts.
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Jim & Angie, Boise, ID
2021 Entegra Esteem 27U
2017 GMC Acadia Denali
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