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The usual reason to worry about epubcheck not passing is that this is required if you are an author/publisher and want upload to some ebook stores. However, a publisher who only has an PRC version is in a very bad place.
As theducks says, the problems are more likely than not to be inherited from the PRC file. However, I would not worry about this unless the ePub fails on an actual device. Actual ePub readers are more lenient than epubcheck.
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