Hi guys, once again I need your help. My 2004 E500 B4 has a defective nav system, gateway is crazy. I ask to MB Mexico to replace the part or to charge me not the full price and they said NO. They want 2,500 USD for a new radio/nav. Can I do something or just to bite the dust? I´m telling you, I´m a huuuuge fan of MB cars since I waskid, grandpa used to have a 1954 300SL and a Ponton, but all these problems I´m having are taking me away of these once great carmaker.