Very interesting. So I ran some pages against plagspotter.com. Does anyone have a preference for this type of tool?
The results indicate about 2-6% duplicate content, mostly sentences that specifically describe a condition or symptom Working on those.
We did discover some wonderful links that we just disavowed. We don't cleanse anything. Or zap anything.
We also deleted the reference to the in-house blog until I can find a way to resolve to the name, and not the ip. Is this a big no-no? We ran into this problem when we configured VMHosts on that server.
We are also racking our brains to try and figure out what might have changed last week. The only thing that comes to mind is that we demoted some links to make google push more powerful subjects to the top. We revoked those this morning.
Thanks for all the advice, from all parties. It has been very helpful. I will post another response if what we try makes any difference.
Harry