Roland FANTOMG8 "volume skips" Questions

...audio comes out of the CODEC and is buffered by Op Amp used as filters and then goes through the volume controls, After that it goes to the jack board with buffer OP amps. First thoughts might be

...are correct as even a factory reset might not set them to default. 2. The next thing is that the volume control itself is damaged which requires internal investigation. Was this working and was ...