RossWal - 6:32 pm on Apr 3, 2009 (gmt 0)

I have a particular product page on a 200 page ecommerce site that's missing in the google index. It has a video on it, and is represented in my video sitemap. A long tail search will produce the video sitemap version of the page (SERP page title matches that submitted on video sitemap - not the HTML title tag).

I want to understand why the page isn't in the primary index - but not sure how to identify the problem. Potential problems in order of likelhood:

1. Dupe content - the main copy for this page has been copied onto 5-10 other sites.
2. Google inspired confusion in the supplemental listings - as I understand it, video search will create a supplemental page in the index for the video component of universal search. My experience says this is still a little beta-flakey.
3. Possible (but unlikeley) that an A/B split test 301ed googlebot to a no-indexed version of the page under a different URL.

Can anyone explain how can I determine which of these potential issues is the culprit?

Will the page self correct if I fix the issue, or do I need to build a new page? If I build a new page can I 301 tie old to the new, or will that torpedo the new?