location of amp in a 2002 SL500 on 2002 Mercedes-Benz SL500

I need to replace the amplifier in my 2002 sl 500.Does anyone know where is it located???and yeah one more thing...the cd changer has stopped working i mean that the option of the cdchanger has disappeared from the screen...any advice on what to do???thanx in advance...

Asked by for the 2002 Mercedes-Benz SL500