Media attachment pages giving 404’s

I use Google Webmaster Tools to track and fix 404’s. I’ve been getting numerous 404’s from media attachment pages, but not the page itself, it’s parent.

An example:

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I have this piece of media, http://www.casterconcepts.com/series-60-heavy-duty-caster-60-08202-60-2-rigid/60-08202-61-2/

If you go to its parent, it’s a 404. In GWT (google webmaster tools), this 404 pops up and is said to have been linked FROM the media attachment page.

Does anybody know what’s going on here and how to resolve this?

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