abs light issue

The abs light on my 97 Acura 3.0 CL sometimes will stay on. So, I had dealer run diagnostic and they said it was a leak between the accumulator and modulator. I am an old time mechanic and hot rodder that's done a lot of engine/transmission and suspension work in my time but I have not worked on abs systems. I did some research on google and found that there is an O-ring between the accumulator and modulator. I would like to replace this part. How difficult is this work? Are there any special tools needed? Thank you.