Looking at a Pioneer DJM 700, has a slight issue - fixable?

Hi all,

I came across this mixer for sale in the local ads for really cheap - less than a hundred quid. The seller says that everything is working but there’s an issue with the master out where the sound comes and goes intermittently.

This says to me that there may be a solder joint somewhere that’s knackered so it may be an easy fix for a half decent mixer.

Could this be the issue? Has anyone else experienced this with their DJM 700, if so what did you do to fix it?

Any help appreciated guys!

Sel.