My CLR 2300 recently started making popping noises. I've tried unplugging the speaker cables as well as using different power outlets, but the only way to make it stop is to unplug the power for the built-in subwoofer. If I unscrew the back and look inside, are there any suggestions on what I should be looking for? I've probably had this for 8+ years, so there's no way it's still under warranty.
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