NAD C320 left channel more dull than the right

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Hi! I need some help on the NAD C320 Amp (older version not BEE)

I found the left channel more dull than the right channel. There seems to be less treble on the left channel. I have swapped the speakers to verify that it is the amp. Otherwise the amp plays both channels without any buzz / noise.

I have upgraded the amp by changing the dc blocking caps. The overall sound is better but could it be that this brings out the difference between two channels? If that is the case, how do I troubleshoot the lack of treble on the left channel?

Would appreciate if you could point me in the right direction.
Thanks!
CJC
 
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