When you take the display assembly and you flip it over with the display facing the table, you would see something like showen in the picture.

First, you need to remove the antenna housing from the unit, this is very easy to lift away from the display assembly as it is just slightly holding with a very little amound of glue. The antenna housing is the lila part showen in the picture, the antenna housing also houses the polyphonic speaker, you can remove that speaker also to change it.

You can remove this speaker with you're Torckx T6 screwdriver, its just held in with glue, its easy to lift it out of its casing.