CAYIN 251B One Channel problem

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Nokeris

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Joined 2018
Hi, recently bought amplifier CAYIN 251B for cheap knowing it has problem with one channel.
Cant find any schematics for it, maybe anyone know what could be problem, it gives high frequency signal but no bass low frequency to one chanel.
This is photo of internals, maybe someone would suggest how to test and from where to start?
 

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