There is another thread called, "Is this a Cripple Cap?"
here.
While it didn't help me, it might help you. I opened my controller, flipped the board, etc. and don't see what I'm looking for. I don't want to cut off the wrong cap since (a) I don't have a soldering gun, and (b) I don't want to pay for a new controller should I screw it up. I'm just waiting patiently for someone to encounter my problem and post a detailed solution.
Best of luck!