This part applies to:

(a) The hearing provided by section 5 of the Debt Collection Act of 1982, as amended, 5 U.S.C. 5514,and,sections,challenging,amount,or; or

(b) A hearing under section 5 of the Debt Collection Act when the Judicial Officer Department adjudicates a petition for a creditor agency under an agreement between the Postal Service and that agency. In such cases, all references to Postal Service in this part will be construed to refer to the creditor agency.