It can be done, but its a huge PITA.
It goes along the lines of:
-from inside, push in the plastic tabs to release the box and let it pull
into the engine compartment
-release the metal fuse holders from the box (the wires are on the other
end)
-pull the entire front harness through the hole (the parts that went through
the hole)
-get new box
-draw harness through, etc.
I confess, last time I replaced a fuse box (yes, it melted), I cut a slot to
let the harness into the hole, and glued the missing piece of the arc right
back in.
HTH
Nick Moseley
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