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.