Our 2nd floor bathtub was leaking due to old pipes, so we replaced the whole thing: New tub, new shower, new pipes, new surround. We still have the ceiling cut away under the tub from the water damage, because now the new tub is leaking. Not with every use, not continuously, but occasionally. To my untrained eye, (and reaching up there to feel for water) it seems to be an issue with the seal between the tub and the drain pipes.
Is this an easy diy fix or do I need to get the contractor back in to take care of it?