It can also be caused by water getting in the keyhole then freezing. When I was stationed back east quite a few years ago they sold small cans that basically were alcohol you could spray into the keyhole to melt the ice, I don't know if they are still sold. Might try spraying wd-40 in the keyhole, see if that works. I used to put a small piece of duct tape over the keyhole if I knew we were getting freezing rain, seemed to help.
John
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John and Patti
Julie and Gracie (Our papillons)
91 Newell
#255
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