I will validate and make your ePub file free of any errors so it can pass the ePub check. Most publishing platforms require this to be done before publishing. Your finished product will be ready for upload, free of any formatting errors and accepted 100% on Amazon, Smashwords, Kobo, B&N, Lulu, Createspace and every other retailers worldwide.
For $5, I will fix 3 validation errors in your ebook. If you add another $5, I will correct unlimited number of errors in your file. I do not limit you with number of errors like other sellers do.