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I would look at moving your link profile to include a lot more benign links like your bare url or things like "click here."  Typically people try to stay below 20% with keyword rich inbound links, and you appear to be a lot higher than that. Anyway, I would look to see if manual action was taken on any page on your website.  Several websites reported getting the warning off an individual page, but many others got it for a site wide penalty.  If you can't find one you might want to move forward with getting more benign links to not be over-optimized.