Electric Piano - No sound (Upper Parkstone BH14)

I am giving away this lovely electric piano. It turns on but unfortunately there is no sound from the speakers or the headphone jack. This would be an ideal project if anyone fancies trying to get it working, I was given this by someone else but unfortunately don't have the time, space or expertise to try and fix it as I'm not sure what is causing the issue. It is in new condition with the stand and fixtures included. Comes in it's original box.