No output from right channel

[Marvintheandroid]

Looking for some helps from fellow Jupiter 50 owners.

I’ve had my Jupiter 50 for a while now and play it live via a midi interface with with MIDI local Off allowing an iPad app which is a software MIDI Patchbay to control MIDI data.
I send signals to the mixing desk from the left and right main outputs of the keyboard.
Everything has been OK until a few weeks ago when the right output seems to have disappeared. I have tried different jack leads and have tried using the ‘Sub’ outputs but there is little or no output on the right channel.
I’m using a different Registration for each song I play with the band.

Has anyone else had any similar experience of losing the right channel? If so I’m wondering if you managed to solve the problem or whether it’s a hardware fault.