This issue just started this weekend. I still have the tilt/vent function, but the ability to slide back isn't working. The sunroof drops down, but won't move back. When the tilt works, the liner panel also started to get hung up last week, but by starting the slide back function, which worked last week brought the panel down. Car is a 1990 300e. With spring finally here and no AC I really love my sunroof. Did a seach but all links to images have expired. I only have the car manual, no repair manual so as much detail would be great.