Hello everyone. My 2006 CLS 55 dynamic seat doesn't work. A while back the diagnostic came back as the pump needed replacing. Can someone tell me if that damn pump is under the seat? In the trunk? I cannot find any youtube videos on it. Also, please recommend if I should buy not just the pump but the reservoir and anything else? When you push the buttons, they light up but nothing happens. When you drive nothing happens. Please help. Also, what is the part number?