The bathtub drain in our upstairs bathroom is leaking. The leak appears to be at the very top where the drain sits into the tub bottom. How can I fix the leak without tearing out the ceiling in the downstairs bathroom?I can get to the plumbing through a opening in the bedroom closet upstairs. But when I feel the drain pipe, I can find a nut to loosen so that I can pull the drain out from the top.As I felt around the pipe coming down from the tub, I found a rubber washer sticking out; it broke into pieces when I touched it. Ran some water in the tub afterwards but no water leaked from the washer.thanks for your help.Mel