[rheavn]

I had a very similar problem as David & Teresa.  Overnight my coach would drop equally on both sides down to the stops.  The difference was that my coach supply pressure would also drop to zero.  The rear didn't drop at all.

Using a spray bottle I found an air leak on the left front air spring connection.  This corrected the left front dropping.  I then found an air leak on the right travel valve on the front six pack.  Replaced the two o rings and now all is good with the right front.  The supply air pressure now stays up.  Problem solved.  Lesson learned is when you are chasing an air leak, never assume there is only one!