Thank you for your response.
As a follow-up question: Because of the failure to properly report the distributions the participants paid an excess of taxes and are entitled to a refund.
Because, however, the 3 year period for filing amended returns has passed, and the participants can no longer receive refunds from the IRS, the plan sponsor will make the participants whole. Can this, then, be done as lump sums by the plan sponsor to participants, because 1) distributions have already been made from the trust assets and 2) the corrective amounts are reimbursements for incorrect taxation, rather than incorrect distributions.
I think so, but would be grateful for any thoughts or guidance on the best way to make this type of correction.