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The computer run system has nothing to do with the leak. Its only a controller.
The black stains are most likely (I can't tell from the picture) being spit out of the "air eliminator" from a dirty heating system. Also from what I can see the Air eliminator looks kind of old. I'd be willing to bet it's failed and needs to be replaced.
They aren't very expensive and simple to install.
Is there anyway to be there when the heat comes on? Thats a sure way of seeing whats going on.
if you can't be there....
Rubber band a paper towel or 2 over the top of the eliminator and see what it catches.
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