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Air brake leaks can be tricky. You can have a relay leaking but something else could be causing the relay to leak (changing the relay won't fix the leak).
I've fooled with the M939 brakes a little. Best thing to do if the leak isn't something obvious is look over the air brake section in the TM...
This is my suggestion also. It's fairly common for a diaphragm to give out. One word of caution- it is possible to replace the diaphragm without buying the whole brake chamber but you better know what you are doing. There's a spring in there that can KILL you.
It could also be something as...
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