You might call the manufacturer of the door directly. I had a similar problem back up north, and found out that they had a 10 year warranty for moisture inside the glass due to seal failure. I was able to get these repaired at no cost. There should be a sticker with the original mfg info, if not home warranty might be able to help, but they might have only the installer, and I am sure the installer is not going to provide a warranty.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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