Firmware or Hardware problem

I just got a used MC6000MK2, first thing i did was check the firmware, i updated it to the latest, After connecting it with Virtual DJ i noticed that everything was working except the pitch fader on the right deck 2-4. I thought maybe the midi mapping was off in VDJ so i launched Serato and tried there. It was the same thing. So i thought maybe that pitch fader was broken? I then moved the Line fader for channel 1 and noticed that the pitch fader on the screen for deck 2-4 was moving with it. The Line Fader is also moving the volume for channel 1 up and down, so it’s doing both? I was thinking i would downgrade the firmware but can’t find any older firmware’s on Denon site. Has anyone had this experience?