Kurzweil K2VX broken/lifted key

Hello, My K2VX came in with a lifted key. I am unsure if it is weighted or half weighted. How can I tell, and will a new key fix this, or could there be other issues with the chassis? Thank you.

Like this -.Kurzweil Key Repair - K2000 - K2500 - YouTube

I would guess at this stage that the key may be damaged too, look around if you find the broken off bit and glue it all back together.
I usually place “repaired” keys at either end of the keyboard where they are less used.