(1) If the Secretary becomes aware that a person is required to repay an amount under section 54, the Secretary must, by written notice given to the person, notify the person of:
(a) the fact that the person must repay the amount; and
(b) the amount as worked out in accordance with subsection 54(2); and
(c) the day the amount became due and payable under subsection 54(3).
(2) The Secretary must give the notice within 30 days after becoming aware that the person is required to repay the amount.