Mission Cyrus Model "Pre" - Schematic needed

[tiefbassuebertr]

On this pre-amplifier device is to perform a troubleshooting procedure.
Maybe one of the member can upload the circuit diagram which is necessary due the high complexity
This thread don't provide the wanted information:
https://www.diyaudio.com/community/threads/cyrus-pre-unbalance-volume.104948/

 

[huggygood]

😳 😳 😳

 

[tiefbassuebertr]

A German member of an audio forum - go to
https://www.analog-forum.de/wbboard/index.php?thread/175449-cyrus-pre-poti-defekt-hilfe/
describe an issue concerning the motorized volume control potentiometer
After switch on the potentiometers goes up and down alternately.
Maybe an error from the MCU IC.
Who know this behavior and the associated reason therefore ?
Some additional images in the attachment.