Having done the exact same thing, I may be able to help.
Upon opening, you will see that the 4 25A fuses are not easily replaceable...at all. They are encased in a hardened pool of solder.
My advice, is head to your closest Hack Space, and take their soldering workshop.
The steps are as follows.
Desolder board
Replace fuses
Solder into place
You be done
Http://servicenet.blackanddecker.com/Parts/Search?searchedNumber=750%20Watt%20Power%20Inverter
There are around 8 models of the 750 watt inverter. The above web link takes you to the Black and Decker site where you can input your exact model number and then you can download the instruction manual which has the details for how to change the fuse.
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