IM 4006 Master

I moved to ahouse that have intercome music system IM 4006 no shematic or any wiring diagram. The master station gave up and I tried to blindly trouble shhot it with guessing. I know this is probably an old model. Is there any recommendation for replacong the master with a similar foot print and more advnced features that can worh with the existing wiring (flat 6 pin cables) and sub-stattions. Thanks for any support you can provide.

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