I am only getting the field names, not the data sent to my email.  Please help.

global class BatchSyncErrors implements Database.Batchable<sOBject>, Database.Stateful{
   
    global string excelHeader = 'ApexClassID,  CompletedDate ,  ExtendedStatus,  JobItemsProcessed,  JobType,  MethodName,  NumberOfErrors,  Status,  TotalJobItems \n';
    global string finalstr = '';
    
    //constructor
    global BatchSyncErrors(){
        finalstr = excelHeader;
    }
    //start method
    global Database.QueryLocator start(Database.BatchableContext BC){
        return Database.getQueryLocator('SELECT ApexClassID, CompletedDate, ExtendedStatus, JobItemsProcessed, JobType, MethodName, NumberOfErrors, Status, TotalJobItems FROM AsyncApexJob Limit 10');
    }
 
    //execute
        global void execute(Database.BatchableContext BC, List<sOBject> scope){

            string recordString;
        
            for(sOBject a: scope){
        
                // Type Cast sOBject to AsyncApexJob
                AsyncApexJob asyncApexJobRecord = (AsyncApexJob) a;
                   
                if(recordString == NULL){
                    recordString = AsyncApexJob.ApexClassID +',' + AsyncApexJob.CompletedDate +','+ AsyncApexJob.ExtendedStatus+',' + AsyncApexJob.JobItemsProcessed + ',' + AsyncApexJob.JobType +  ',' + AsyncApexJob.MethodName + ',' + AsyncApexJob.NumberOfErrors + ',' + AsyncApexJob.TotalJobItems + ','+ AsyncApexJob.JobItemsProcessed + ',' +AsyncApexJob.JobType + ',' + AsyncApexJob.TotalJobItems+ '\n';
                } else {
                    recordString += AsyncApexJob.ApexClassID +',' + AsyncApexJob.CompletedDate +','+ AsyncApexJob.ExtendedStatus+',' + AsyncApexJob.JobItemsProcessed + ',' + AsyncApexJob.JobType +  ',' + AsyncApexJob.MethodName + ',' + AsyncApexJob.NumberOfErrors + ',' + AsyncApexJob.TotalJobItems + ','+ AsyncApexJob.JobItemsProcessed + ',' +AsyncApexJob.JobType + ',' + AsyncApexJob.TotalJobItems+ '\n';
                }
        
            }
        
            finalstr += recordString;

}

    
    //finish
    global void finish (Database.BatchableContext BC){
       
        system.debug('**** Final String *** ' + finalstr);
        //TODO: pass this string to create CSV in your CSV Method.
         //   String csvContent = finalstr;
         //       Attachment attachment = new Attachment();
         //       attachment.Body = Blob.valueOf(csvContent);
         //       attachment.Name = 'csvFile.csv';
              
         //       insert attachment;
       
         //TODO: Create an generic method to send emails & pass this attachment.
         
        AsyncApexJob a = [SELECT Id, Status, NumberOfErrors, JobItemsProcessed, TotalJobItems, CreatedBy.Email,ExtendedStatus,JobType,ApexClassId,MethodName
      FROM AsyncApexJob WHERE Id =
      :BC.getJobId()];
            
        Messaging.Singleemailmessage mail = new Messaging.Singleemailmessage();
            mail.setToAddresses((new String[] {'all60388@adobe.com'}));
            //mail.setReplyTo('noreply@privatebudget.com');
            mail.setSenderDisplayName('Batch Class Errors');
            mail.setSubject('Batch Class Errors');
            mail.setBccSender(false);
            mail.setUseSignature(false);
            mail.setPlainTextBody(finalstr);
            system.debug('@@@@ sendEmail - mail : ' + mail);
            Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
 
    }
}


In my email I get:


ApexClassID,  CompletedDate ,  ExtendedStatus,  JobItemsProcessed,  JobType,  MethodName,  NumberOfErrors,  Status,  TotalJobItems 
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems
ApexClassId,CompletedDate,ExtendedStatus,JobItemsProcessed,JobType,MethodName,NumberOfErrors,TotalJobItems,JobItemsProcessed,JobType,TotalJobItems


Thank you