Actually...there is a way to do it.. The hey was that when you stepped off the train from the N terminal, at the main terminal, you needed to tern LEFT, not right and out of the secure area. Once left, go up the escalters, turn 180 degrees, and go up the second set of escalators. Now you are facing the security checkpoint from the perspective of already having gone through it. Go to the RIGHT, into the terminal area, then tern left down the terminal, (now heading south). You chould come upon the (B?) gates, and I believe you can slide through to the C gates...Although, now that I write this, I think this is where I got stuck last time. Could someone try this out?