We just purchased a home with a NuTone Intercom System the IM4006. Every now and then we hear clicking throughout the house via the speakers and sometimes the release button after speaking does not release so that we can go back to the radio. Therefore I'm looking for any help here? I'm also looking for a manual on this particular unit. Any suggestions? And finally, I'm looking for an outside speaker for our unit - have the wires but the speaker is missing. Thanks for you help in advance!

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