To Ultra Magnus, to show him proof that you've had your memories tampered with, so he can arrest the person who did it.

[Ratchet watches Fulcrum move away from him, and he looks suddenly, painfully exhausted.]

...you don't have to come with me. But since the only person who could have possibly done this to you is the person to whom this room belongs, I'd advise you to relocate as soon as possible.