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I've come across several methods that might work, but this isn't one of them. There is no way that I'm aware of to completely repair a scratch other than replacing the lens or the scratched element.
I know from your earlier post that it only shows up at f/10 or less, but can you describe (or provide an example) of what the problem looks like? Plus a description of how large the scratch is. There are possible solutions that are relatively safe, but the stress has to be on "relatively" and even a safe method inexpertly done could create more problems.
I'd like to be certain that action is needed before sticking your neck out (as it were).
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