Page is a not externally linkable
-- Google SEO News and Discussion
---- 121,000 404 Page not Found - How to remove them?
Zivush - 11:24 am on Oct 27, 2012 (gmt 0)Thread source:: http://www.webmasterworld.com/google/4511635.htm
Have you heard about xenu - free broken link checker?
It is a freeware that you can use to crawl your entire site to find broken links.
You may want to try it.
Brought to you by WebmasterWorld: http://www.webmasterworld.com