Marshal AVT150HX Tribute

Hi

I have a problem with this amp. The OD2 channel has got no sound. The "clean", "accoustic" and "OD1" channels are working as normal except the "OD2". When I press that channel button, the channel button lights up, but there is no sound. I could not get the exact schematic for this amp. I am attaching the AVT150H schematic, which I think have the same preamp schematic. The power amp for this amp uses transistors, whereas the normal AVT150H uses the TDA7293 power IC. Can someone please assist.

Thanks
 

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