We had a major problem with the sprinklers, which caused water to get in the house, and it caused a discoloration around the edges of the carpets. Check to make sure you do not have a water problem, I had the carpet pulled up, and it was obvious what was going on. As this had happened recently, the professional carpet cleaner was able to remove the stains, and the sprinkler was repaired. It has been fine since.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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