Well done, sir!

You not only covered everything, you diagnosed it for us too. :thumbsup:

Seriously, I think you nailed it.
Looks like PH lockout to me.

Might wanna wait for a more expert opinion, though.
I'm jus' goin' by things I've read and pictures viewed.

(Best to limit important advice to stuff I have first hand knowledge of, yah?)

But your diagnosis looks spot-on and PH 7 is too high for soil.

I have yet to be in those shoes so I'll hang around and learn how to fix it here.

Aloha and good luck.
Weezard