public class MaintenanceRequestHelper {

    public static void updateWorkOrders(List<Case> updateCases){
       List<Case> casesToInsert = new List<Case>();
        for(Case caseToCheck : updateCases)
           if(caseToCheck.Type == 'Repair'  && caseToCheck.Type == 'Routine Maintenance' && caseToCheck.Status == 'Closed'){
               casesToInsert.add(new Case(Subject = 'Maintenance Case', Type = 'Routine Maintenance', Date_Reported__c = Date.today(), Vehicle__c = caseToCheck.Vehicle__c, Equipment__c = caseToCheck.Equipment__c));
           }
    }

}