When the director can reopen a benefits decision

(a) At any time within one year from the date of a final decision with respect to wages upon which benefits are computed, the director on the director's own motion may reopen the decision if the director finds that wages of the claimant pertinent to the decision but not considered in connection therewith have been newly discovered or that benefits have been allowed or denied or the amount of benefits have been fixed on the basis of a nondisclosure or misrepresentation of a material fact. (b) At any time within two years from the end of any week with respect to which a final decision allowing or denying benefits has been made, the director on the director's own motion may reopen the decision if the director finds that the benefits were allowed or denied as a result of nondisclosure or misrepresentation of a material fact. (c) At any time within one year from the end of any week with respect to which a final decision allowing or denying benefits has been made, the director on the director's own motion may reopen the decision if the director finds that an overpayment, due to reasons other than fraud, has occurred. (d) In any case in which the director is authorized by this section to reopen any final decision rendered by a referee or court, the director may petition the referee or court to issue a revised decision.