[Glenn and Laureen]

Richard and Dave, thanks for the input and Dave, thanks for your diagram and photo. Your diagram seems to match my general layout. I found it especially interesting to see that you have no MAC valves and only what I call Skinner valves. I think in my system the Skinner valves are used as one way valves in association with the 4 down valves and the air pressure regulator in the back 6 pack manifold.

Richard, that mystery switch near my leveling switches in my center console seems totally unrelated to the air system. I think it is related to an electromagnetic lock system that a previous owner installed on the access panel over my generator bay in the front of the coach. The wires are the same color (purple and yellow). It is supposed to be a push and release system but doesn't work right now.

Also Richard I am holding in reserve your invitation to give you a call until Laureen and I have actually tried a few things and can ask questions from a more informed position. We appreciate your offer very much.

After a month of beating this stuff to death and over analyzing everything, Laureen and I have a developed a few theories of what we can do next. We will start by replacing one down MAC valve in the next few days that we think has a significant leaking port. I anticipate a significant reduction in the air leaks after that. If so, we will replace the other 3 down MAC valves, which I think are also leaking to a lesser degree because of similar problems. Next we will replace a 5th MAC valve that has a definite air leak (bubbles) because of a leak in the casing (not a port). We may end up replacing all the MAC valves at once as they are not too expensive. I will post an update when we stop speculating and actually get something done.