How to replace the rear speakers in a 2006 C70?

[KJtotheB]

So my driver side rear speaker finally blew and is rattling away. I brought it to my car audio guy but they couldn't figure out how to gain access to the speaker in the ways of removing the rear panel.
I've tried to Google this but no luck. Can anyone help me out?
And taking it to a Volvo dealership is my last resort since they would probably charge a ridiculous amount or give me a hard time to even just look at it.