Don,
I've gone back to 027, but when I was experimenting with the 003 beta, I could hear a tone on 12 meters the strongest, then 11 meters, 10 meters not as strong because the noise level is higher, and on 6 meters. I could hear it weakly in digital mode, not at all in CW, very loudly in LSB and there was some time or greater noise in USB as well. This is all with a dummy load attached. It doesn't seem to be injected in the RF stages, but somewhere in the digital to audio conversion - maybe. I can still hear it in those bands with firmware 027 as well, but much weaker and only in digital mode.
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73, Dan - W2DLC
Daniel Conklin