the release, or release and substitution, of property subject to the lien of the indenture (and the consideration therefor, if any) unless the fair value of such property, as set forth in the certificate or opinion required by paragraph (1) of subsection (d) of
section 77nnn of this title, is less than 10 per centum of the principal amount of indenture securities outstanding at the time of such release, or such release and substitution, such report to be so transmitted within 90 days after such time; and