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You should have no air going to either one of those lines with the valve closed. Pretty simple. If the valve is broke you can get TR1 valve and use it instead. It is a flip switch valve like the deuce and M939 trucks use for the front axle actuation. This would allow air to pass and to those air...

Only 2 lines receive pressure. To the bellhousing and to the air horn when you pull the lever. Should only have air to that pull valve with it shut. Not that much to trace

if you think an 813 has alot of air lines then you should look at a 939 truck. it has more air lines than you have blood vessels. There is a diagram

You only have 2 small tanks on that truck i believe which isn't much air. It would only take an hour for even a non hearable hiss to leak those down. Fix what you can and go from there. Most lines on that truck are metal with inverted flares... Easy way to fix that is to replace the fittings...