Bluesound POWERNODE repair - how to get it open without destroying it?

Hello, anybody else repaired one of these? The main hurdle is getting it open. I have tried to lever up the rear plate, but it's not budging and I don't want to break something by forcing it.
 

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"The backplate actually consists of two layers that are stuck together with double sided tape. Use a prying tool of sorts to separate these two layers. The outer is thinner than the inner. This exposes additional screws that you can remove. After that you can separate the top and shell of the case."

This is what I've read online, but I don't know how to separate these two layers without damaging it, or even to get a prying tool into such a position since the top plate appears to have folded edges.