The Change Log page in the admin section provides a way to track when entities were changed and what values were changed, if something stops working correctly or needs to be restored to a previous value.
To view a record of an entity type's changes, simply choose the table you're interested in from the dropdown list:

Note that the recorded information is in XML so it can be difficult to parse, and determining which table to view changes in may be difficult depending on what information is being sought. If you have questions, your Godlan service contact can help.