1st time posting. I have a Napoleon 1402 wood burning insert. I need to clean the blowers and replace the adjustable heat control knob. I can see a couple of screw heads through the vents on the side, but can’t get to them. Is this where I need to get to? How many screws are there? Anyone know the socket size? I can’t find any instructions anywhere on how to even get to the blower. Any help is appreciated!