Arrangement for a power electronics unit in a hybrid vehicle power train, where all attachment points have a total thermal conductivity corresponding to less than 10 degrees temperature difference on a Kelvin-scale between electronics of said power electronics unit and the outside of said first transmission side for 5 kW of heat originating from one side of said attachment point. The lens assembly provides high optical performance in a compact and easy to manufacture system. The guide rail that is coupled to the outer sliding door is selectably moveable by a sliding door mechanism between a first and a second position. A liquid seal device forms a liquid seal between the member and the substrate.