In my former life I would have recommended you black that information out so that it couldn't be used, or at least you knew you shouldn't get it. If an allegation of discrimination ever came up, the burden of proof would be on the institution to demonstrate that they didn't consider that information. I would probably keep a list of the loans in the audit workpapers, but also make sure you document your solution. That will show that you are aware there was a problem, and took action to correct. Also do retraining (and document!) for the appropriate parties.
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I disbelieved what he was saying so hard, I probably created an alternate universe where it wasn't true.