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Piperboy84... you say....
Removing and replacing self-contained, front instrument panel-mounted navigation and communication devices that employ tray-mounted connectors
This I take to mean that you can slide in or out any equipment that uses a tray....
However, I think the tray needs to be fitted by a qualified technician in the first place.
Also, from memory, an intercom is not a tray mounted piece of kit?
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