I have abs 2" grey water runs, the pipe is cracked at 3 joints, has there been sim. Problems, should I replace with same?

Not familiar with gray ABS pipe, there is a gray PVC pipe. Grey PVC pipe is most often used as electrical conduit. Are you referring to water pipes or drainage pipes? If water pipe is it hot or cold?

Sorry, I meant the sewage is grey water from shower & sink, the color of the abs plastic is black

I know of no problems with ABS pipe cracking at joints. Are the cracks parallel to or perpendicular to the pipe? Is piping properly supported?