Buddy BE VERY CAREFUL lead bends are a real pain, if your home is that old don not even attempt to repair the problem as you will only cause more damange.
My granddad use to install this things , as they have to be crafted to the need.
If you still have one and it is leaking, you have a problem. Get ready to remove either the cieling or the bathroom floor for replacement.
Most lead bends are 4" lead short sweeps, this size is quite hard to replace with any materails today as they were designed in place.
Good Luck
Bernie