There used to be a device that trimmed the edges of CDs to balance them. I don't know if it would help for warped discs but it might be worth a try. Does the disc look flat when on a flat surface like a table? If not, you may be able to flatten it by putting it on a truly flat surface and putting a weight on it for a week or two. a little heat would help in the process too, maybe around 110F.
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