Buy a new device. Sony doesn't make readers anymore and it'll cost you way more than buying a new reader. Have you looked at the Kobo devices at all? Sony integrated their store with Kobo. Perhaps you've already made the transition with any books you bought through Sony.
It'll allow you to continue to use epubs rather than going to a whole new ecosystem.
It's your dime & your opinion of course, but I wouldn't spend the money on repairs.
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