DJM 900 NXS - Ch4 Fader Issue

Hi All,

So I'm having a problem with channel 4, Sound is coming through to the mixer but not to the speakers, I can listen to the channel through the headphones but the fader makes no difference when put up or down. I've tried ch4 fader on ch2 and it works and visa versa ch2 fader in ch4 doesnt work so the problem is on the pcb board I would say. Has anyone had a similar issue or have any idea where to start?

I would be failry handy repairing or soldering myself so any guidance on where to look/start would be greartly appreciated.

Regards,Damien