I'm trying to remove the back plane of my DSP7200.2 but it won't budge.
I'm pretty certain I have removed all screws not holding components on the inside.
I'm sure there's some gooey mass along the edges holding it in so what's the best way to remove it?

Main: Marantz Cinema 50, Meridian 271, DSP7200.2, DSP5200HC, DSP5000 rears, Meridian 210.
PC/Headphones: Mytek Liberty II, Sansui CA-F1, Sansui B-2301, Sennheiser HD800, Kef R3