[Burlyman]

Hi Gurus.  I am assuming that I have a slow air leak in the system.  While I am parked at a campground, my compressor kicks on about every 90 minutes, day and night.  While it doesn't bother me too much, I figure that this is additional wear and tear on the compressor and will wear it out prematurely.  I cannot hear any air leaks, so it must be pretty slow.  I know that the previous owner replaced all the air bags, so it shouldn't be coming from those.  Any pointers on where to begin or what might be the best way to go about tracing this down?  I figure I might save some time and aggravation by asking the Gurus first.