I have an owner-only plan (no employees) that maxes their 401k & profit sharing contribution ever year. So $66,000 intended to be contributed for 2023, and $69,000 has been contributed for 2024. We are now discovering that the 2023 deposit of profit sharing has not been made (401k deferral was), and also discovering that the profit sharing deduction wasn't taken on the 2023 tax return. Is there any way to clean this up so the client gets the 2023 deduction, or is it too late?