I have a 1994 C180 Euro and had the same problem 2 years ago. Its all fixed now. Just imagine my shock when 2 tech shops told me to consider about A$1200 in costs for taking out the whole gizmo to find out if the thing has some parts broken or warped or torn???? Even the local Benz dealer told me that. However, due to my luck, I had to go and see the dealer due to a radio aerial which shot out like a spear gun and they greased the rails and brackets and whatever from the top with some super Benz grease and charged me only A$10 for the grease and some labour content. It was still moving a bit slowly and I went to change to a big high power battery and guess what? It moves like a dream now............................like new! Actually it was jamming the tilt action before this cure and also stopped halfway on opening and closing. Cheers and hope you get yours fixed fast.