Peter-
The RV dealer should have a leak detector that will find the leak. It works the same as the techs use to find freon leaks on A/C systems only this one is designed to detect LP. You might be able to find it yourself by using a soapy-water solution in a spray bottle and soak all the connections in the area, if leaking the solution will bubble, may take a few seconds for the bubbles to appear.
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