Electric organ.

[Iron231]

I have a little electric organ, a kawai E-3D

Recently I knocked it a bit hard, and since then, the volume output has been about 10% of its former glory.

Everything sounds the same, although the volume on its maximum setting sounds like a whisper.

I can take photos, and post the schematics that were inside the organ if it helps.

Can anybody guide me on how I might repair this thing ?