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Try opening the top and remove the computer ribbon cable from the pc board. Clean the contacts and blow out any dust. I had a problem with my copy and save key sticking. In other words when I pushed the buttons nothing would happen. This fixed my issue and I havent had any more issues since. I...

Check the line level switch on the back below the input jacks. Mine had the same problem so I had it bypassed because I never have a need to use the 2:90 alone without the preamp. When that switch goes bad you could see a +20db volume jump.