I recently watched a video on youtube about Dianetics and it covered going repeatedly back over past events which had a negative issue attached to it to remove the issue.
In theory they are talking about looking for the first bead (1st negative issue) on an unknown string and removing it to help remove the rest of the beads (negative issues)
How well do you think this would work? using the premises of the client/explorer not giving you any details about the event.