I've only gotten the port screw to loosen. I will try again later, though.

EDIT:Uuurghh! I've just realized that one of the bottom screws are actually damaged too! If I try to turn on the PB at this point, will it be alright? I haven't used WD-40 on the internal screws yet.

This is what I did so far:

1:Carefully sprayed WD-40 on a cotton swab

2:Rubbed each hole plus the port screw.

I've since cleaned the screw holes with a cotton swab.

Suggestions?