small help with Marantz 6000 mod (removing PCB)

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I am trying to mod my Marantz 6000OSE player but I am at a loss how to remove the control PCB. It seems to be sitting on top of the main PCB, set off by two plastic things that don't appear to be either screws or clasps. (See picture 6 in http://www.marantzphilips.nl/marantz_cd6000_ose_le_cdplayer/; one of the plastic things is near the ribbon that connects to the front panel).

How can I remove these plastic things without breaking them?

There is a similar problem with some plastic rocker arm that connects the power switch with the main PCB; is there a way to detach it without breaking it?

Thanks for any help.
 
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