Broken Buzzer/Intercom System

The buzzer system in my apartment building in Park Slope has been broken for a few months now. People can buzz us but the intercom system is dead and we can’t buzz people in. Before it finally went, it had been acting flaky for a while, so not sure if it needs to be fixed or just completely replaced.

Does anyone have a good reference for someone who specializes in this kind of thing?

Thanks,
Carolyn

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