the border attribute isn't valid xhtml which is probably why epubcheck is throwing errors. if your images have borders you should be styling them with css, ie
.myclass {border: 1px solid black;}
<img class="myclass" src="../images/my_img.jpg"/>
and then removing the border attribute in the html. if you're just trying to get rid of the attribute and don't need to worry about styling borders, you can unzip the epub and do a global find/replace on all your html documents, replacing border="0" with an empty 'replace' field. not sure if there's a way to do this in sigil or to control the output to html in word, though.
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