I think Diablo got one of best type of fuseboxes out there. MTA fusebox parts are so common, I could go tomorrow and buy them local auto part store and make new one.
What is the issue, you can swap and change wires and connectors, totally rebuildable part if you like?
BorgMann, last summer I had a brake light and dash light issue that took me month or two to figure out. Turns out it was wiring harness connector front right side of car accessible by a small triangular panel under the car under headlight assembly. It was a burned ground wire within the 9 wire harness connector. Try that and other connections before you go pull the fuse box apart. This is a wet area in that water from rain or washes drips down under and around the headlight assembly. Both fuse boxes- at passenger footwell and in engine bay- are well protected from water. Just my thoughts.