We have a 2007 Tiffin Phaeton with a Freightliner chassis that is losing almost all of the air in the air system in roughly a 24 hour period.  We have had a Freightliner repair service in GA and a RV dealer in FL work on it.  Freightliner in GA found a small leak at a fill valve, and they changed it.  There was still a leak.  We took it back to them.  They couldn’t find anything else.  The dealer in FL found some more valve leaks and a leak on an airbag.  They changed a rear airbag, tightened th