NS$ Channel 4 not working.

For the Techies out there:

I have a numark NS6 and I often use channel 4 (closest to the power button) for my aux input needs. A couple weeks ago, I stopped being able to get audio from channel 4 both from the RCA inputs and the quarter inch input...I've tried switching between the Line and Mic inputs on the back of the controller and on the front by the fader. I can't seem to understand why it's not working and I'm having a hard time believing it's the controller itself as it's practically new (out of the box) and well taken care of. Has anyone encountered this/have any suggestions on ways to fix this?
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