We worked on this a good bit today. Here are the results.
If I maunally raise the coach all the way, the air does not dump out after 45mins.
If I do an auto level the air dumps as described above.
Did find out I may have an air line swapped with another. If I press the rear lower button, the front right lowers. Hum the wonders of used coaches.
Still looking for advice.
Chris