I've followed JSWolf's suggestions and used KindleUnpack to convert AZW3 to ePub and then used the Calibre editor (thanks also to BetterRed) to check and edit the ePub. The red text problem is solved but the Aura HD still refuses to open the file giving the same error message: "This document couldn't be opened, there might be a problem with the file". The Aura says "Processing" and gets to 6% before going straight to the Home page.
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