34 CFR §674.40

1. (a)An institution may not exercise the minimum monthly repayment provisions on a note when the borrower has received a partial cancellation for the period covered by a postponement.
2. (b)If a borrower has received Defense, NDSL, and Perkins loans and only one can be cancelled, the amount due on the uncancelled loan is the amount established in § 674.31(b) (2), loan repayment terms; § 674.33(b), minimum repayment rates; or § 674.33(c), extension of repayment period.