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Head volume knob trouble

Got my head back today from the shop after having some minor things fixed and I noticed something fishy with it when I plugged it up.

I was setting my gain with the master volume turned all the way down, to set the clip level, and I noticed that sound from my bass was coming out of my cabs even with the volume all the way down.

It didn't do this before the repairs.

Should I be worried about this? Or should I call the amp shop back tomorrow?