I had one 'fail' a few years ago. I figured if it was already not working I couldn't mess it up any worse, so... I popped the case open and found small amount of moisture in it, I let it dry out. Then I cleaned off the corrosion that built up, some was bridging some of the parts of the circuit board. After that it worked perfectly again. When I put the case back together I added some silicone to seal it up.
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