I have a MY00 430 cab. Until this year, I had problems with the top occasionally not going down or more often, not going up. Once the dealer adjusted the alignment of the top mechanism. When it won't go down, I believe it has to do with the sensor the confirms the boot cover inside the trunk is in place. When it won't go up, I believe it has to do with the alignment of the top mechanism under the hard boot. Take it to the dealer and have them check the trunk boot cover sensor. Good luck. (So far this year, I haven't had a problem with the top, so maybe your problem will just go away.)