Hello dear SLer to everything I have to open my roof otherwise the disk can not be changed, and with a crack in the disk no tuv yes that’s so. In my manual nothing is described as I can open it manually please ask for instructions if someone has it. last days I wanted to run again after the whole snow and ice cream, start aboard running, only the lamp for the rollbar and the roof lamp light permanently nothing does itself, 2 days later exactly the same nu r this time I can move everything. so 2 days later the same thing happens again and nothing happens, everything I found in the forum was wrong. What I found is that it was buzzing in the passenger door, and that my locking system goes and then again does not press after 6 times and it often flashed in the mirror. LG Mario