Amazon doesn’t repair Kindles. They replace devices under warranty, and most likely want the the non-working one returned to them. But “repair” isn’t part of the deal.
Books are tied to your account, not a specific device. A device correctly registered to the account that holds the books would be able to download those books, unless device-book compatibility was an issue.
Books copied to the device incorrectly would pull a DRM error, not an “internal” error.
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