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Is the right-side panel you speak of, the one on the right-hand end? or is it the right side of the upper panel with the controls and indicators mounted on it?
OK, I understand.
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Look at the new right-hand end. Any holes in it for screws, will have to have corresponding screws removed from the Roland device before the original right-hand end part may be removed from the keyboard in general.
OK. And that's a good cautious approach that you should stick to.
You may have to do considerable disassembly. The back case or the bottom case may have to come off first... and so all its screws would have to be removed first.
It's possible that the 8 screw holes are structural. That is, that they attach the right-hand end piece to the main chassis (structural basis) of the whole keyboard. So that the keyboard's skeleton inside, might be seen as
first the chassis
then the two ends attached to it
then the outer case (back side and/or bottom side attaching to the chassis and also the keyboard parts attaching to the chassis.)
I have searched for disassembly information, or at least a service manual that might show how its parts fit together, and have found no source of such information, regrettably.
Removing the outer case is simple enough. Remove *all* case screws. A part of the case *will* become loose, and be removable.
Then more screws or other fasteners will become removable, and so on. The device had to be assembled; disassembly is just the reverse of that.
Look for little rubber circles on the underside of the case. If removed, screws will be under them.
Why not the 6 plywood screws?