AA QD5-MKII crackling issue

Hi all,
This is my first post here. I joined because I am having an issue with my American Audio QD5-MKII mixer, which I noticed the last days.
Whenever I am raising or lowering the volume through the master volume knob I am having some loud crackling noises from the one speaker. The crackling is worse when I am changing the volume rapidly and after some repetitions of the move it turns better - while still noticeable.
I did some troubleshooting with the cables and speakers and found out that it is indeed the mixer's problem (btw I'm using the balanced outputs). I also opened up the unit (my warranty ends in 20 days and I am currently abroad so I gave it a go) but, not being a expert, I couldn't see anything unusual.

Any ideas?
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