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Use the anchor text tab with it set on "phrases" and "all pages on this root domain." Once it loads - look for high volumes of exact anchor text. Specifically terms that are not branded or the websites domain/URL. This is a big identifier of spammy tactics.

How about combining related posts onto the same page, so each page has more content? If it is Penguin though, Google's algorithm must think you've violated their Webmaster Guidelines somehow?