I can't offer any direct help, other than to say getting to that fuse requires a lot of disassembly. I know you've been working on batteries, but unless you feel comfortable with repairing electronics, such as laptops, it can be overwhelming. Of course, taking it apart to fix might be the easy part. Putting it back together can be tricky. Be sure to take LOTS of pictures as you go so you can refer back to them, and label every part. Of course you have to start by taking the skin off, and you don't want to rip or damage the skin. There are a few videos on removing the skin that should help.
