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Service manual for Benytone MA-4000 power amp

Hello to everybody in this nice forum. I am looking for Benytone's MA-4000 power amplifier service manual or at least schematics. One friend of me vandalized the power supply by adding a new transformer and now I am searching for power supply data together with idle current adjustment procedure.
Thanks in advance for your possible help.

Is there anybody out there

Is there anybody out there can help?