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Clint:
Looking at your drawing and the factory drawing I attached to the first post shows the top Norgren passing through the lower one with the key off. Hence I am ASSUMING (and we all know what that means-lol) the top Norgren is leaking past the seal. Read in another post that most of the time an air leak in cold weather is a seal and a leak in hot weather is a connection. That reads true in this scenario, it leaks more on cold days.
I am not using the bus for awhile so I will leave the balloon on a see if it grows.Chuck