Remediating a problem is always helpful.  However, fixing a problem may not eliminate or lessen the consequences.  Whether it is an investigation, a civil lawsuit or a criminal matter, it is always better to say that a problem was identified and is now corrected.  In civil cases, remediating a problem cannot be used against you.
In the criminal context, it is always beneficial to state that as soon as a problem was identified that it was addressed and fixed.  In addition, it is important to put in place policies, procedures and mechanisms so the conduct does not occur again in the future. Also, doing so may trigger the end of the problematic action and therefore begin the statute of limitations of any potential liability.