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  • To check the phone speaker, you'd need to dismantle that. You could just test it by connecting a battery to the terminals for it and seeing if it makes a noise.

    For the button, you'd need to open up the buzzer box. I assume there are screws under the things circled in red. It's perfectly plausible that the button for your flat is the only one not working and that it's still the button box. Maybe the weather seals have worn out.

  • See if you can isolate it first though. Or you might get more of a buzz than you were hoping for. The signals making the buzzy and talky noises will (likely) be low voltage, but the whole thing is probably driven off the mains.

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