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The serial numbers and letters from your model/serial tag, are required.
Usually on the serial numbers the first four numbers are year week ex. 9912 would be about March 99, the 12th week of 1999. That is the way I would encounter a non registered appliances and I would use the date of actual production to determine warranty status. If it is a newer model which the Maytag serial number has 2 letters after AA would be year month as in AA is Jan of 02 etc.
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