Security Console - Role review exercise

Dear all

We are currently starting a project to review the custom roles to simplify the setup & data security. As the system is already in use for a while in production, it will be an exercise that needs to be carried out carefully. I wanted to check if anyone has any experience with making this modification on a production live system and if there are any tools provided by Oracle to assist in this (f.ex. a kind of report or overview of the customizations done based on the roles (EL Expressions,...)).

Many thanks, all input is welcome!

Kind regards