Regarding the cause...don't know if this is it or not, but mine stopped working at one point shortly after buying the car (it's a 2001). There's a switch (or whatever) in the hand brake that has to be activated (by engaging the brake) before the roof mechanism will do it's thing. Sometimes it goes bad, and the roof transport won't operate. (Basically, the car "thinks" the car may be moving, so it refuses to open/close the roof.)
I can't give you any other details---I had a CPO warranty, so I didn't even try to fix it. Just took it into the dealership.
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