Reverse-engineering a Logitech speaker set

Last week I received a broken Logitech 2.1 speakers set. The Logitech z-340 specificaly. The power light turned on but no sound and the volume knob produced a crackling sound when turning so the amp in the subwoofer is still working. I've tried disassembling the subwoofer but it's mostly glued together. So I first reverse engineered the speaker unit. It contains a small circuit board with the controls for the subwoofer. The left speaker and the subwoofer are connected with a 10 pin cable with din connectors. The speaker unit also contains a preamp for the headphones output