The issue was failed capacitors for the +/-15 V rail, causing oscillation in the preamplifier circuit. I had to replace the opamp U8 as it had been running hot and was covered in conductive goo. Multiple violently failed solder joints on the power amplifier board had caused charring.
Good luck if you have one. I don't think they're likely to suffer many other issues, seems like a decent quality device.
Throw money at me: / ffcossag
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