Good morning Artdeco; As all of us with older coaches the air leaks from the system are always going to be there. Some small and some that need attention, but usually can be fixed. For us who do our own work it is a bottle filled with soapy water and away we go under the coach and spray everything down looking for those bubbles! Sometimes it fittings or a solenoid or pressure protection valve that needs to be replaced. In my opinion, the big one, is if the coach air bags are leaking air. If your coach has the air leveling system the O rings on the solenoids start leak air and need to be replaced and those O rings are available.
Since your are on the east coast, hopefully someone in your area has a shop that knows what they are doing with an RV. To me these places are getting harder and harder to find, but they still exist. Hope you get some answers here to fix the problem. Have a great week!
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