Admin/Editorial Tools/Search issues
The Search issues page allows search over issues identified with publication items. Issues are not necessarily errors in the publication item record but concerns or potential problems that can only be identified by comparing against all items in the repository, e.g. duplicate or very similar titles. To have issues to search over, you must have run the bin/issues_audit script. Ideally you should set up a regular schedule task (cron job) to run this script daily.
Using Issues for Quality Control provides more information for how to make use of issues for better maintaing your EPrints repository.