September 7, 2016
      
                  
        
  Author(s)
  Michael E. Sharp,   Thurston B. Sexton,   Michael P. Brundage
 
       
            
    
    
        To facilitate root cause analysis in the manufacturing in- dustry, maintenance technicians often ll out \maintenance tickets" to track issues and corresponding corrective actions. A database of these maintenance-logs can thus provide problem descriptions