Ford Focus C-Max parasitic draw

My car is registering a parasitic load of 520M/A,causing my battery to constantly drain,this is reduced to160M/A when I remove the audio, the diagnostic cloister and the internal lighting fuses.i have eliminated the alternator,I also changed the radio because the time reverted back to 9am every time the car was re started however this made no differance,a mechanic had a look and said it looks like a faulty fuse box.due to the cost of a new one im,e a bit reluctant .can anyone help/advise me.