Air Compressor ??

[Waterloo]

I have been chasing a leak like that for years on this ProStar of mine. Had it in a few shops that were dead silent and went nuts with the soapy water and spray bottles a few times. Never found it, only other place would be behind the dash somewhere is all I can figure, but have never found anything there either when having the dash apart. I just replaced both cab air bags, that seemed to help, but still losing air somewhere. Good luck!