This is a debatable issue and one that can only be truly answered in a court action, but it is my belief that if you refund at the zero tolerance you have made your original material disclosures accurate thereby negating the 3 year ROR. (Just as a side note, this is the only time I think you can "cure" a ROR problem. Failure to give the ROR or giving an inaccurate ROR is not curable.)
Randy and I normally agree on issues, but in this case we do not and I honestly do not think you will get a consensus on this issue.
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The opinions expressed are mine and they are not to be taken as legal advice.