[Elecraft] Problem with K3s Subreceiver

[Peter Alterman]

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Happy new year, all.

I have a K3s with the subreceiver installed. Recently the subreceiver doesn't respond to the 'sub' button and all the knob does is roll through the items on the config menu. I'm sure I hit a button - or series of them - accidentally but I can't find instructions on how to reset the subreceiver.  Advice/instructions greatly appreciated.  Thanks in advance and 73, Peter