You mean modulator right, not the accumulator? Never really heard of an ABS component called the accumulator, but hey I could be wrong. A dude in my old class had also a modulator on I think it was actually a '96 GSR go out on him and he had Two options:

1) rebuild the accumulator with another person in the class
2) go buy another one from the junk yard.

I think he opted for the rebuild, haven't seen him since to ask him how that went. You might want to look into that.

YUP, I'm wrong, there is such a thing as an accumulator.