I just installed Light Racing UCA's this weekend and a full Icon setup and had my ABS, differential and slip lights on when I was done. I determined that although the sheath of the passenger front ABS looked intact, I could see inside a crack that the ABS wires inside it were ripped near the UCA bolt. I spliced in a new wire section, heat shrinked it, wrapped it in duct tape to make it thicker to survive impacts, and wrapped some of the original rubber sheath around the sensitive points so it doesn't get pinched again. It works good as new.
You can either repair the ABS line or replace it. In hindsight it might have been simpler to replace it, but I'm stubborn.