There were various bad connections. Had to reseat some socketed chips and clean edge connectors etc.
This one needed some solder. All the other gain pots were yellow 5k. It looks like they replaced second from edge connector but damaged the hole and put a rivet in. The top side wasn't soldered so went open. Soldered rivet you can just see under the pot and it's happy. This prevented adjusting offset for channel 7.
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