Ps4 pro new black screw in the power supply

Hi everybody, I did bought a ps4 pro used but it was never open, it was made in august 2018 and was in used with the previous owner more than 1 year and for the side I can notice some dust, so I start to make the process to clean up and add new cooling paste to the gpu, but I did find it have in the power supply a new black screw I did check some video tutorials but nobody is talking about it and the more recently tutorial it is from 2017, so I think nobody made anything other video after it I believe. If anybody can send me some help.
it is the ps4 pro model CUH-7215B.

I did find the right video!!!

Don’t open the power supply unless you wish to risk being thrown power supplies have enough power to throw a person

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