Usually we leave it down for the dog & groceries. 2000 ML320. I went to put the left rear seat in the up position and the lock lever does not release. I can feel the cable underneath is slack-obviously disconnected or broke. It is the 1 1/2 size seat so the middle is tight to the drive shaft hump and I can't get a finger in to find the catch. Has anyone had this happen and have a solution?