Keystep 32 lower 8 keys don't send note on / note off events

[pig_latin]

Hey,

I encountered this issue a while ago and don't really remember how or when it started.
Could have happened when I upgraded my MacBook Pro from an old 2012 model to 2018.
When I open the MIDI console in MCC all I see is the

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Ch 10 Channel Aftertouch events when I hold the lower octave keys.
I do not see note on and note off events in the console, unlike any other note above the lower 8 notes.

Do you know what might be the issue here?

I attempted doing a firmware upgrade and factory reset of the keyboard.
Transpose centre pitch is set to C3.

What am I missing here?

Thanks!

[vyanezf]

My lower F key didn't work as well.
 I fixed it by opening the keyboard and cleaning the golden circuit underneath the rubber that receives the impact of the key, with a little piece of cloth with a tiny bit of alcohol.