I might want to check the fresh water tank to see if there is a bunch of pink there?
Depending on the age of your RV, you might also find value in looking at the parts catalog where you can study the layout of the lines to get a better idea of where they run and where the pink may have gone.
https://www.winnebago.com/Files/File...m/Plumbing.htm
But a 39 foot will have quite a lot more line to fill than shorter with less fixtures, etc.
Possible it has a water filter housing to fill?
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!