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All of the other keys function.
I have tried different fingers, pressing harder, restarting the NuRad, different synths. I can play the G#/Ab note by using RHp1 (along with LH1, LH2 and LH3 of course).
The screw that holds the key on was snug, but not tight and it loosens and tightens normally.
firmware v1.5b7

In the menu go into “adjust” and then scroll up to touch sensitivity. Tap on that key and see if a dot is moving at all. You might need to move the threshold in there more to the right so that dot goes to the left of the threshold when you touch it.

Let me know how that goes,

Thanks for the quick solution! I had the touch threshold set too low, and LHp1 was actually working....but all of the time, whether I touched it or not. Seemed like it was not functioning and had the effect of making the instrument play a half step sharp. Haha .. Thanks for your quick help!