If you look at the epub in Sigil, you will see Arial and TNR being specified. Search for <font and see if you can locate them and eliminate them and their end tags. Then the user can choose from available fonts on their reader. These font tags probably came out of Word.
It is also possible that font information is hiding in the stylesheet as part of a style. Open the stylesheet of the epub and see if the font information is there and get rid of it (without damaging the rest of the style.)
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