Most of the time, when this happens, one of two problems has occured.
1) The servo arm has slipped. The arm on the Aerobird servos are pressure fits. No gears and no splines. After a very bad crash, they can loosen up and slip.
2) An electronic glitch can cause the servo to wrap the line around itself. Don't ask me how, but mine did it once, and my friend's did it twice. Both of us ubserved this on power-up.
You are going to have to take the control board out and examine the servos. The arms should be facing each other.
This link is to a thread that has pictures I took of the board removed from teh plane as part of a reinforcement of the motor mount area. Perhaps they will help you. Note the position of the servo arms.
Aerobird internals photos
Hope this helps.