The 2003 fuse box is a "dumb" box should you decide to start the ts there.
The usual problems have been overloaded the fuel pump circuit or spade connectors that have opened up due to the hot/cold cycles encountered though use over time.
Disassembly is pretty straightforward, take a pic of fuse locations so that you have a location chart by color once you start the reassembly. Once it is apart you can use needle nose pliers to squeeze the terminals to make the fuse connections more secure.
Good Ideal I will do that.