40.136—Superseding bond.
         A manufacturer of tobacco products shall immediately file a new bond to supersede his current bond when
    
    
    
        
        (b) 
         The appropriate TTB officer approves a request from the surety on the current bond to terminate his liability under the bond,
    
    
    
        
        (d) 
         The amount of the bond is no longer sufficient under the provisions of  § 40.133 or  § 40.134 and a strengthening bond has not been filed, or
    
    
        
        (e) 
         The appropriate TTB officer considers such a superseding bond necessary for the protection of the revenue.
    
    Where a bond is not filed as required under the provisions of this section the manufacturer shall discontinue forthwith the operations to which such bond relates.