Ensoniq EPS Classic with no sound

I have an EPS that was working perfectly a few days ago and now all of a sudden I get no sound. The odd fart or squeak but that happens when I’m not even touching the keys. When i set it up for sampling I can hear the source sound no problem which means audio is passing through the machine in sampling mode and it samples fine just no sound at playback. Could this be a dead Volume slider?