I see this is a very old post, but in case anyone else is looking....I installed a new iPod compatible stereo on my 2001 360 SE and while running the cables for the new controllers I found the amplifier. It's located in the main cabin behind the right side backrest of the dinette. To get to it, you need to remove the recessed storage unit that is directly below the 4 cabin light switches. There are 3 or 4 screws hidden under some caps. Remove the 4 screw and the whole unit lifts out. I attached a pic of mine.