Need help/advice finding INTERMITTENT water line leak

By chance a Forest River brand? Forest River, and some others, have a bad habit of attaching flexible tubing to one side of pex fittings and then using pex crimp rings to clamp it. They all will leak eventually as flexible tubing should be attached to barb fittings. The solution is to use a pex removal tool to remove the crimp and replace the crimp clamp with two small hose clamps. RV plumbing is typically done on the line by pre school classes who were taking a tour of the factory that day......I think lol.