I recently bought a 380 Series II (Base model). Really enjoying it and I reckon it's a very underrated car.

But it has a fault with the driver's seat height adjustment. The motor that operates the rear cushion height is fine, but the front cushion height is stuck in the highest position. The switch is working since it powers the motor and it rocks in its mounts when activated. However the screw drive isn't budging and the seat cushion consequently doesn't move. The pivots on the rocker arm at the front are not seized.

Has anyone else had this problem? Any suggested solutions? The motor is manufactured by Valeo.