Frank,
Look in the lower corner of the glass for small white writing. That is the code you will need to order, and it will also be the basis for any possible warranty. Try putting a black background behind the glass to assist you in reading it. Otherwise get a good measurement of the glass area to order the whole sash. Then get a Brosco book from local lumber yard or box store to verify your window. Get a price with the yard and then check Andersen's website and call them in Minn. (I think) and get a price for them to drop ship to you via UPS. Don't be shy asking for warranty.
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