Hi, can anyone answer this one? My 03 Kalahari has a manual adjuster in the side of the drivers' seat for the lumbar support mechanism, this appears to have broken/come adrift as the knob now just turns and no adjustment can be felt. Is a repair possible, is it easy, or does it have to be replaced? My local independant Landy specialist says he hasn't come across it before. It's giving my back jip on long runs!