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Unless I am mistaken, you cannot re-temper. Once the temper is shot, the only fix is to completely reheat-treat, from what I understand. However, I do not know how viable a solution that is...

I think that W&B is quite possibly shot... the only way to know for sure is to set a bevel, and see if it holds. Looks like it may have been heated up at a high temp, IMO.