How to remove Audio unit from 2004 getz
 

Hi All

I am having trouble removing my audio unit from my 2004 getz. When playing cd's the right channel keeps cutting out so I thought I would take the unit out, give it a clean and see if I can get it working again. I tried cd cleaning disks but they don't do the trick.
However I have no idea how to actually get the unit out? The manual has no information. Do I need some kind of special key? Any help is greatly appreciated. Thanks