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Default Troubleshooting Bose QC2 Noise Canceling Headphones

I'm not getting any sound in the right ear piece of my headphones. I opened it up and tested the speaker by connecting it directly to an audio jack cable and it works. I also tested the continuity of the wires running from the left ear piece to the right, from one end of the external audio cable to the other, and of the wires running from the speaker to the circuit board.. If I directly connect an audio jack to the wires at the circuit board end, the speaker works so I don't think it's a bad solder there. Does anyone have any other suggestions? This is my first repair project so no suggestion is too basic.