Sig:X: Some Issues

Hi Y’All, newbie here.
Sorry in advance for my maybe “wooden” language, I am not a native speaker.
I have two problems with my Sig:X (SXEE080190): When I activate the boost in the clean channel, the boost is also active in the other channels, which shouldn’t be the case, I think. The other problem is that in the crunch channel, the treble control has virtually no effect, and the bass control is also rather unsatisfactory. The Pedal issue I had pretty much from the start but it did not bother me very much; the problem with the controls in the crunch channel i noticed onely lately when it came back from servicing. My technician (www.sigis-ampshop.ch) and I would highly appreciate if someone could provide him with information to solve these issues.