Temple of Negrete Marvel: Ultimate Alliance

Can anyone tell me how to get the pearl from behind the jammed door in the temple or negrete. I am suppose to press (x), then the next key which comes up looks like an (0)numeric, or (O)alpha. I have tried press every single key on my keyboard as the second key press, but nothing works. Has anyone else gone through this? Can anyone help me to resolve this? I am not sure I can complete the game and even if I could, I hate the thought of leaving any stone unturned :{).

Thanx