A Silent Roland JD-800

I recently bought a Roland JD-800 from Japan and it seems it got damaged in shipping, as it makes no sound. In the bottom left, part of the gray side panel is cracked and that’s right about where the volume slider is. And I think this is the main reason as to why it makes no sound. Somehow the volume slider got knocked out or something. I’ve tried calling repair shops in my area, but none wanna take on the task.

Open up the lid and check that area. You can find the service manual online on which screws to remove. The JD-800 is one of the easier ones to do this on as the entire top panel opens on a hinge like the hood of a car.