Marshall YJM schematics ? for repair...

[Feufeu]

Hi at all;

I have need Marshall YJM schematic, if somebody have it ?

We have contact Marshall Amplification many time,
but no reply... We have need schematic for repair this amp,
noise gate stop to work. it acts like a master level.
and is SMD components on rear panel PCB...

thank in advance for you help.

Regards FD.