179.15—Follow-up report.
        
        (a) 
         Each manufacturer who makes an initial report required by  § 179.13 shall submit a follow-up report to the Commandant by certified mail within 60 days after the initial report. The follow-up report must contain at least the following information:
    
    
    
    
        
        (3) 
         The number of units in which corrective action has been completed as of the date of the follow-up report;
    
    
        
        (4) 
         The number of first purchasers not notified because of an out-of-date name or address, or both; and