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If the site is doing well, avoid panicking - lots of webmasters freak out and go on a rampage trying to remove every link, when they should just sit back and relax. If we're talking thousands and thousands of junk comments, it's something you might want to be concerned about. If it's a lower number, I wouldn't lose too much sleep over it and would focus on building quality backlinks going forward. Contacting blog owners is a nightmarish task because the sort who have blogs that auto-approve junk comments are usually not the most tech-savvy and often don't even think to include their contact info anywhere. Lots of them don't own their own domain, so you can't get their whois info that way either. If it were me, I'd put my time and energy into building good, diverse backlinks rather than spending tons of time trying to remove these links that don't seem to have negatively affected you.

Great point - thank you!

Sometimes things seem so confusing but yet they are extremely simple. Thank you, you've helped

Oh this was/is major. I had one keyword go from # 8 to #480

Do you mean as in duplicate content or too high keyword ratio? If so, I checked for duplicate content, didn't find much off site or on, fixed what I could. All the content was originally written and added to the site months ago. Survived Panda in Oct. Nov. and Dec. so why now? It's a mystery...

i just ran a diagnostic - no errors, no duplicate content, nothing..