I'm in need of Schematic for the Nutone IM-4406 Intercomm (base unit) system. I believe that the IMA-4406 would work also

Would appreciate if someone could advise where I might find or can direct me to where I can either get the schematic or purchase it. Tried Sams and at a loss as to where to go. I replaced a tact switch on front panel and had to disassemble all the PCB's ( pretty compacted unit) many connectors. I thought I had it right but the certain functions including the intercom portion no longer work. Suspect that I may have a cable wrong. Would like to verify the cables with prints.

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