Not sure about class A, but my class C has a manifold supplying all gas lines, underneath thats accessible by crawling under the motorhome. I can follow the main line out of the tank, to this manifold, then all the separate branches off of it.
If you get that far, maybe you can tug on the line out of the refer and see which moves on the manifold.
Replacing-
keep new line sealed if feeding though anything, dont get crap in it.
may need to connect new line to old to feed if extreme angles in feed.
is it compression fittings? no need for teflon if so (others may disagree).
not compression, use teflon gas as @RogerR states.
take care not to over tighten fittings.
check for leaks with soapy water.
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