Needed: schematic or manual for 2091

I'm searching for either the schematic diagram for an old NuTone 2091, or some insight into where the door stations would connect at the master station. The other stations connect to the board behind the listening/talk switches at the master station, but I don't know if the doors should occupy one of those station spots. The door stations are intercom-only--as opposed to the radio-listening features in the other rooms. Does anyone happen to have an old manual and/or schematic diagram of the boards? Thanks in advance!

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