Replaced Keyboard But B G And T Do Not Work Any Suggestions Macbook Pro 15 Retina Display Mid 2015

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I have just finished replacing the keyboard in my mid-2015 Macbook Pro 15” laptop. All works well but 3 keys down the middle (T G B - upper and lower). I have tried adding in a British keyboard (as seen in other forums) but no joy. I am going to try running diagnostics and see if this turns up anything.

Sounds like you got a bad keyboard!Where did you get it?