idle current i(bias) is slowly dropping in one channel

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jlk

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Joined 2014
Hi, I have a hk6800 amplifier where the left channel can't keep the idling current bias setting on 39mv. Every 15-30 min. it is decreasing around 1-3 mv. until the sound gets bad. Can it be caused by a bad transistor on the output pcb 5 ?
 
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