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If you do decide to do it, study up before doing so. There are some other parts which also make sense to change while your in there, and some related tasks like greasing and so forth which will help lower the load the motors have to deal with.
Try to find the best brand and stick with it. Many of the parts provided by Autozone and the like are of rather poor quality. They have a lifetime warranty, but the cost of the part isn't much compared to the time and effort required to replace it. Often times Autozone will have a part with say a 1 year warranty and a lifetime warranty... those are 100% exactly the same parts. The price difference just justifies the risk of them having to give you another one.
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I replaced them about 2 years ago and they have been fine since. I recommend the Siemens brand motor from Autozone and also looking up the directions online (it involves drilling in a few spots). Don't forget to grease the mechanism while you are in there.
good luck,
Joe
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