Audio Logitech z623 subwoofer stopped working

The Z623 is such a brilliant speaker set, but suffers from random quirks and glitches. I bought mine earlier this year, and within a month, I got the infamous 'crackling sound' issue. Got it replaced with a brand new unit. Works fine (so far). These things aren't cheap (for a 2.1 setup).
 
So I took the right speaker from my friend who has the later Z623, anyway my subwoofer is working with that. I guess, the bass knob is the culprit. Anyone found which one works, or is there anyway to repair it ?
 
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