I kinda agree with Scott. If it hasnt ben changed it is more than likely te fusebox, they can actually be stripped and all the dry joints re soldered but it aint really worth it TBH... I would suggest you can get a fuse box for less than that mate... where bouts are you??
I bought a new one for mine was less than 200... tht is with lecky roof, without the roof they are cheaper, easy to fit too, ten minute job really.
all you have to be sure is the 3 digit letter code printed on the box in the corner if you drop it down is the same on the new one... what you need to look for it will be BBB BBA BAB ABB blah blah along those lines.
Have you tried taking the main beam relay out??
also, if you can try a light switch unit ( the bit on the column) first as these are also a common fault (about 60 quid).
HTH