2422.32—Certifications and revocations.
        
        (2) 
         The Regional Director issues a Decision and Order requiring a certification and the Decision and Order becomes the action of the Authority under  § 2422.31(e) or the Authority otherwise directs the issuance of a certification.
    
    
        
        (b) Revocations.
         Without prejudice to any rights and obligations which may exist under the Statute, the Regional Director will revoke a recognition or certification, as appropriate, and provide a written statement of reasons when:
    
    
        
        (1) 
         An incumbent exclusive representative files, during a representation proceeding, a disclaimer of any representational interest in the unit; or
    
    
        
        (2) 
         Due to a substantial change in the character and scope of the unit, the unit is no longer appropriate and an election is not warranted.