Strugling to find the Audio Gateway Unit in my 2003 E class Estate. A few friends of mine work at Mercedes so called them for advice. They thought it was in the rear left boot area, next to the SAM Unit. Took the car to them during thier lunch break, low and behold they could't see it either. The reason I was looking for it is because I wanted to swap it for the one iI have in my saloon to see if it solves the intermittant sound fault that keeps occuring on the Command APS unit. Whether the radio, cd or dvd is playing, every 2 minutes or so the sound drops for a split second and starts again. If any one has any ideas ???