Ford Taurus

I have a 2000 Ford taurus SE, it has 117,000 miles on it--6 cylandar. The warning light keeps coming on. I looked in the owners manual and it said it is the check transaxle light. I took it to the small dealership that sold the car to me and they don't know why it is coming on. I turn the car off and restart and it doesn't come back on. I know it has to do with the transmission, but what? What should be looked for? I don't notice anything wrong with the gears switching or the ride of the car.
August 3, 2007.

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