Question to those who have been hit by this 'Fred' update. Do you have any 301 redirects from an old age domain? Or built 2nd tier links to your PBN? I'm asking because a lot of my links are PBN built over time from BHW marketplace and I have not been hit. So I'm having a hard time accepting the idea that this update is related to links (in general). If it is it must be something VERY specific.