Linkage moves with ease, its the motor that seems bound and the box is riveted closed. There are several T15 screws that make it look serviceable, but once all those are out, you still have the rivets. It's mostly plastic anyway and not worth trying to drill out the rivets. Price is ~$60-$90 for a new one. I have found the part numbers: 20777855 and 20777854. Not sure which one is left or right, apparantly, there is quite a price difference between the two units. Used parts are pretty cheap, but hate to replace with used and have the same problem next week.