A sollution (other than replacing the mainboard and if the chip isn’t toast yet) would be to properly clean the MacBook and replace the termal paste. I have got a candidate for that right here, I will investigate and report back.

Only 2 screws, the others come from the bottom and secure the plastic shield removed 2 steps before this,

also 1 of the marks is a push-button...

Take heed!

First remove the mainboard screws and take note of what goes where.

The heatsinks will come off when you remove the screws securing the fan and you will have to clean them and reapply thermal compound.

Far from done here..

TAKE NOTE OF WHAT YOU REMOVE NEXT, you will need the notes when you put it together again.

Definitely not 7 screws, could be 6 but I am guessing it was 2 like on the picture, the rest was removed before and the 3rd from the right is a push-button :P

I still need to do the reassembly, I will try to pay attention to these details and take some pictures to improve the guide.