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NuTone Intercom Photo Gallery > NuTone 2400 Stereo Music Intercom System > NuTone 2402 main cap showing leakage

NuTone 2402 main cap showing leakage

Here you can see why it's necessary to replace this part.  The arrow points to leakage from inside the capacitor.  While this capacitor may still read the correct value on a capacitance meter, the ESR rating of the cap is way to high, making the component useless.