(a) If the Endowment is the creditor agency, it will promptly refund any amount deducted under the authority of 5 U.S.C. 5514, when:

(1) The debt is waived or all or part of the funds deducted are otherwise found not to be owed (unless expressly prohibited by statute or regulation); or

(2) An administrative or judicial order directs the Endowment to make a refund.

(b) Unless required or permitted by law or contract, refunds under this section will not bear interest.