Please see the photo. We had a (plastic!) stake hit this (red circle). There doesn't appear to be any leaking from the red circle. Unfortunately, there is quite a bit of spray from the bottom of the elbow joint (the Yellow Arrows indicate the direction of the spray). If you click the photo you can actually see part of the crack on the bottom of the elbow joint.
EDIT: As oriented in the picture, the bottom two pipes (with the T and the straight through) are NOT AFFECTED, as far as I can tell.
I'm at a loss as to how to repair this. Any ideas?