Would like to get old Nutone intercom music station to working again

I just bought a house that was built in '75 and has the Nutone Im-303 unit installed. It doesn't work, the radio will not turn on. Thinking maybe just the transformer is bad (which I have no clue where that is located) or maybe it just doesn't work at all. It looks to be in good shape, inside and out. Where do I start to look/troubleshoot??? Is there a wiring diagram out there for this one? Really like to get this old thing working again. Thanks for any info!

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