1692. Express release granted to one of the sureties releases the other sureties to the extent of the remedy they would have had against the released surety.
Nevertheless, no payment received by the creditor from the surety for his release may be imputed to the discharge of the principal debtor or of the other sureties, except, as regards the sureties, where they have a remedy against the released surety and to the extent of that remedy.