[Elecraft] re audio distortion when using auto notch on K3

[Fern Rivard]

I just spoke to a friend who has K3 vintage #1021 which he received mid june. He's having severe receive audio distortion when activating the auto notch. This will happen on signals S9 and stronger. He thinks that the radio has firmware 1.73 but couldn't figure out to bring it up. How does one bring up the firmware version?

Fern