Not later than 15 days after the issuance of the charter of the Assistance Board, the Board shall retire all debt and equity obligations issued to any System institution under section
2216f
(a)(14) or
2216g of this title (as in effect immediately before January 6, 1988) at the book value of such obligations (determined as of January 6, 1988) and shall pay such amounts to the holders of such debt and equity obligations.