We recently purchased a 2011 Range Rover Sport HSE and when we went to clean the car realized that the larger side of the rear split seat will not lift up. Can open the smaller side no issues. The back locks into place on both sides no issues. I go to pull the tab to lift the butt portion of the bigger split and it will only lift about an inch or so and then catches. Any ideas how to fix this or at least get access to under the seat to try and remove the whole assembly?