Repairing major water damage on an RV roof.
In this case the EPDM rubber was still in decent shape; it was simply a caulk failure at a seam which caused a leak.
We noticed the dripping during a hard and steady rain and after further inspection, realized it had been leaking for some time. There was evidence the previous owner had tried to recaulk the seam on more than one occasion.
Too late for us, the water sitting inside the roof had taken its toll.