Hi @RP08 ,
Unfortunately there is no such degree of audit as AC never handeled natively versionning.
Here how you can investigate on an issue:
0- try to know when the modification arrised
1- if the "modified by" and "last Modified" cannot be trust or found on the objects that have been modified, you can play to Sherlock Holmes by analysing the "logins.log" file on the server: Log files | Adobe Campaign
It contains every logins that try to log on the server with the timestamp (and even the IP if I'm correct)