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most likely one was breaking off and now it finally did or one went out. Usually the front one is the one that brakes.
One thing you could do is remove them, Open them up and make sure they are not rusted inside. If they are you can use ball point pen spring to rebuild the original springs, clean, and seal up with silicone. After checking these things if one is still bad stop by the dealer and let them tell you which one. Then buy it and do it yourself
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.