No benefits accrued under a plan after the date on which the Secretary of the Treasury issues notice that he has determined that any trust which is a part of a plan does not meet the requirements of
section 401(a) of title 26, or that the plan does not meet the requirements of
section 404(a)(2) of title 26, are guaranteed under this section unless such determination is erroneous. This subparagraph does not apply if the Secretary subsequently issues a notice that such trust meets the requirements of
section 401(a) of title 26 or that the plan meets the requirements of
section 404(a)(2) of title 26 and if the Secretary determines that the trust or plan has taken action necessary to meet such requirements during the period between the issuance of the notice referred to in the preceding sentence and the issuance of the notice referred to in this sentence.