I have forgotten my Apple iCloud username and password. I can't remember the email address I used to sign up for the account. I need to turn off Find My iPhone before sending my iPhone in for servicing. My screen won't turn on at all so I don't know what else to do. I am being told that if I don't turn Find My iPhone off I can't get my phone fixed.
Is there any way I can recover my account information and turn off Find My iPhone in this situation?