I haven’t had the need to take one of these heads apart but, I believe there is more to it than just some LED’s. When activated the clear signal change to stop when the power is removed from stop the signal changes to restricted and has a timer before changing to clear. That logic circuit is in the head and, probably part of the same circuit board. You probably smoked more than an LED or two. I think Chris has the right idea, check eBay as well as some of the forum sponsors.
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