While on a IFR flight in my Ovation and in IMC, both the 750 and 650 quit transmitting. I then had alot of static from both radios. I ended up squaking 7600. After trying turning one radio off at a time that was no help. Then I thought it might be the internal audio panel. After pulling the circuit breaker for the audio panel I finally got the 650 working. The rest of the flight was without further incident.
The next day I checked the radios. The pilot headset was dead. I could key but no audio. My mechanic started checking everything. He pulled the pilot's side interior side panel. All of the connectors looked fine. After tracing the wiring he found a connector. When he opened the connector it was filled with corrosion. After a careful cleaning, everything started to work perfectly. This connector is part of the factory original wiring.