FM300A Schematic or service manual?

Hi DIY'ers.
I have recently bought a FM300A clone from Aliexpress.
I would really like to have the diagram or a service manual for the amp, does anyone know of this?
I have found the diagram for the amplifier section alone, but would like to have the power supply and auxillary circuits (relay control, peak detection etc) diagrams as well.

Does anyone have it, or know of a place/shop that does?

Kind regards,
The Priest