I have a 3-way switch at my back door that doesn't do anything. There is a receptacle with 3 switches. One does the exterior flood lights, one does the lights to the stairs downstairs, and the other is a mystery. I think it "should" be to turn on the kitchen b/c that's the room you walk into. But, the other switched in the kitchen aren't 3-way or even wired for it. I know it's a 3-way b/c I opened up the cover and it's wired like a 3-way too. But it doesn't do anything when I turn it on or off. I can't find ANY other 3 ways in the house or in the detached garage about 20 feet from the house. Is there a way to find out what this switch actually goes to?