About NAD S200 R channel is no work!help...

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My friend's NAD s200 power amp, R channel is no work!
The relay is OK,the power is OK..
If open the amp,begin any hours(anytime about 3hours) is OK,the sound is natural,after this any hours the R channel is no work,the relay is still close...
And confirm this PCB has problem...
 

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