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 in accordance with the Employee and Labor Relations Manual, sections 450 and 460, challenging the existence, amount, or the repayment schedule of an employee debt to the Postal Service; 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.