I have an 18 year old Broan music intercom. I opened it and the model reads KWH40 with K1400 or K1401. Also in writing appears to be KUe01. You can speak from the main unit to a remote unit, but can't hear from the remote unit back at the main one. Also, the music has a static laden sound that isn't clear like the main speaker is blown or the antenna isn't connected well. The remote speakers sound the same so don't know if they are supplied directly by a line output or go thru main speaker. Can you help. House was built 18 years ago. We were not original owners and can't seem to find a manual

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