How to replace Signa S2 woofer element wires

Can anybody tell me how to open up the sub (not the amp module on the back) so that I can replace the wires that go from the amplifier to the actual speaker element.

I got the Signa S2 soundbar system with a silent woofer to repair. I removed the amp module and tested the speaker resistance with multimeter and it showed open connection.
Leater, by looking into the inverter tube, I found out that apparently some mice have got inside the sub from this tube and chewed through the speaker wires :D

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