So I just installed a bathtub and I've got a leak! The floor is slab on grade. I used some of that green PVC-ABS transition cement. Obviously I couldn't do the normal 1/4 turn when I dropped in the tub, so I just sort of crossed my fingers as I dropped the tub in and as it dropped in, guided the ABS tube into the PVC elbow.
As you've probably guessed, when I filled the tub the next day, the damn thing leaked from that fitting. Not a huge leak, mind you, but enough to get some spots on a "witness paper towel" i folded around the joint when I drained the tub.
So, now what do I do? I can't really move the tub at this point (set it in a bed of mortar and adhesived down the leveling feet). This is a crazy tight location. Part of me wants to say, "Heck, it's underground, just ignore it." but that part of me knows I'll always be thinking about it. I'm considering perhaps cutting the PVC tube that runs up to the overflow and trying to glob some cement over the inside of the joint, and then repairing the overflow tube with a Fernco.
Here's a picture of the situation
Here's a link to a larger version of the picture: http://i.imgur.com/milQ2.jpg