No, dont go to the dealers....unless you are pushed for time with a pending mot and totally desperate/willing to be ripped off, i would try and contact one of the tech2 owners on here, The Boy will direct you.
In the mean time,
its easy to raise the self levelling to top out/full hight. this takes 2 or 3 minutes in which time you can watch the head light beam on the wall and see which one moves and which does not. You should see the lights move a little every second or so. You will be unlucky to have both head light motors fail so if both are static it would suggest a suspension sensor is at fault, if they look ok then def tech2 to diagnose the exact issue. these parts aint cheap.
If you still have working self level, locate the self level sensor under the rear of the car, just drivers side of the dif near fuel filter, remove the wire tie rod with black plastic rose joints at each end, just lever it off the bottom with a screw driver, and raise the right angle arm fully.
Turn the engine on and leave it running, the suspension should rise. Then watch the lights and see which one does not move via the beam on the wall. They need to be on obviously.
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hth