108. If any goods upon which duties are levied ad valorem are damaged or deteriorated due to an unavoidable accident or cause after they have been entered for warehousing and assessed under section 80 and before they are cleared for home consumption, their value in the damaged or deteriorated state may be appraised, if the owner so desires, by an officer of Customs and the duty leviable thereon shall be diminished in proportion to the diminution of their value and a new bond for twice the amount of the diminished duty may, at the option of the owner, be executed by him to replace the bond originally executed.