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I'm afraid that I don't know of a way to change these other than finding them all and manually amending them. We do let you know the URLs of the referring pages so you know where to look - this is easier to see if you download the CSV file for these 404 errors from your crawl. I think the Broken Link Checker Wordpress plugin can also offer you a list of these broken links that you can click through directly to amend them but I don't have any personal experience with this. Sorry I can't be more help!