MPC 3000 issue, output #6 making noise

Like the title says, output is making a crazy scratching noise. I've been working around it, because it's not that big of a deal. Last night however, I had to track out a bunch of stereo samples, which sucked, because I could only use 1-2, 3-4, 7-8.

Any ideas of how to fix it without sending it in to Forat? I'm pretty handy with the soldering iron.

Thanks in advance.

edit: I've used DeOxit on it and Callilube to no avail.