IM-3303 not working on radio, intercom, or the doorbells after 6 years of good service.

I have been using the IM-3303 for 6 years. Everything worked great then just stopped. No radio, intercome, or doorbells. The digital display on unit works, and it shows power to all buttons. I tried to do the diagnistics, but nothing happened. The display never changed from the time. I even tried turning off the remote stations and disconnecting CN701 to do the line voltage test. Still nothing happend. What should I try next?

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