moonroof opens

What is your question?

I took the car in for a recall (summer 2010). They did they did a moonroof recall also. We had not had any problem with the moonroof. After the moonroof recall it begin to open up any time it wanted to. Happens about once a month now and the switch remains on closed but it is open. Can't trust it anymore could open up in the rain or a thief could get in and steal valuables we may have. I talked to the dealership but they said I had to have it diagnosed and would cost me at least $100. They will refund me the money if it is their fault. What should I be prepared to say if they say it is not their fault.