Searching for a tool or technique to repair a migrated wiki that now says "server tag not well formed" when the user tries to display the page.

A month ago we migrated from SP 2007 to 2010, using database attach.

This morning, a user accessing a page on a wiki encountered a "server tag not well formed" error instead of the wiki page.

Is anyone aware of any tools or techniques that could be used to update the page to correct what ever kinds of problems would cause this?