Numark CD Mix-1 service manual

[janalumi]

I got a secondhand Numark CD Mix-1, but the audio on channel B is much lower than channel A. I've taken it to a local audio repair shop, but the service manual is not available to help them repair it.

I saw this thread but it's closed:
https://www.diyaudio.com/community/threads/numark-cdmix1-service-manual.302588/

Does anybody here have the Numark CD Mix-1 service manual?