I will ask Sylvia to speak to that one.
We have a good sense of what's required. Our main objective is safety and security, so if you're looking at it from a safety and security perspective, and that is the key piece, we do seek to always make sure we're doing what we need to do. In terms of what needs work, many of them need work to improve the situation they are in.
Sylvie, do you want to add to that?