Since there's been a way to check to see if your flagged for a ban follow the instructions below.....
I'm just interested to see how many there is at the moment. (this was getting lost in the other threads so posted with correct title and it'll also give us some feedback)
Thanks to the OP for this....
Download the attached file.
On your 360...
Go to your console Settings Page/System Settings to get your Serial number and X: Value.
Enter your Serial number into the XVAL software.
Ener the encrypted XVAL value - it's the one listed X : xxxx-xxxx-xxxx-xxxx (16 hexadecimal value)
Click Decode and cross your fingers..