The seat adjustment switch group is shown on the WIS drawing below, mounted on a separate sub-panel on the door liner.
It says that S91/2, S92/2 can be pressed out with the door liner removed - but it must be possible to prise it out without removing the entire liner. Use a wedge and go carefully from the underside, as the retaining ears are shown at the top.
Note: I haven't tried this myself.