I don't have a wire that color in my 2004 wire diagram. Closest I found was a wire identified as hot in Start and Run.
You might be able to fix the board. You need to clean the corrosion off it with an electrical cleaner, such as CRC QD Electrical Cleaner, and a tooth brush. Then you'll need to verify the integrity of the traces in the board. They can be repaired, but it takes a delicate touch and experience.
This thread that's a sticky at the top of the forum has lots of good info in it:
Hello! It looks like the recommended site is out of stock for the particular fuse box I need (2L1T-14A067-AN) and just about all other boxes. I'm sourcing for my '03 Ford Expedition 5.4L FX4. Do you all have any experience with rebuiltcarparts.com or any other recommendations for sourcing a...
www.expeditionforum.com