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Problem Solved: After the second replacement KMA 20 Audio panel was not the answer, I removed it and while sitting in the right seat, Stared into the mounting box, thinking, "Now what?" There is a connector in the back of the mounting box that connects the wires to the audio control panel when...

Thanx Spike. I believe all switch position combinations were tried but I'll have to give it another go to verify. Your explanation of how it all works helps to make sense of it!

I was wondering if it isn't a wire that got shaken off of the connector attached to the back of the mounting box or maybe worse, old brittle wire broke. Just before the issue appeared, we had experienced some afternoon turbulence.

Last week I acquired a 76 17-30A with KX135 nav/coms, a KMA20Tso audio panel and an old GNC300 Gps/with the transceiver disabled. A little more than 3/4 the way from Dallas area to Phoenix area, it appeared that she lost the ability to transmit. Landed in Goodyear squawking 7600. After sliding...