[77newell]

Tom: from your description it's not clear to me at what point you connected the temporary air supply. In any case, it looks like you will have to test by segmenting the system into smaller an smaller pieces until you find the culprit. My guess is an airbag, but that is just a guess based upon the fact that they are the only moving part in the segment you tested.

I agree with Richard on the rate of loss. I can park my coach for weeks in warm weather and not have it drop at al. In winter it will drop in a week or so, the solution is to ignore it and move the coach somewhere warm with me in it