We moved into an older home that is in overall good shape but many of the fixtures and equipment in the house is original to when it was built in the 70s. Not sure when the intercom system was installed but very likely came from when the house was originally constructed. Currently it powers up the tape deck rotates. it does make an audible tone that is constant but picks up no radio and the coms between the hub and the remote stations throughout the house do not work. How do I start troubleshooting this system? Will it be easier to gut it and replace with modern components? We want to keep the original aesthetic look but bring it up to a modern, or at least functional standard. Thanks in advance!