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I had the same type of problem but my n.c. would come and go. I found the problem when I did a repack of the drums. One if the wires near the brake pad had rubbed a spot and exposed some wire and I would get a short and the n.c. would show on the controller. I too though it was a bad controller and I did replace the controller. I think you need to pull the drums and look for a damaged wire.
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