Whenever I run my shower, I get a water leak in the room directly beneath the bathroom. Taking baths are fine, however, I only get the leak when I run the shower for "longer" than usual showers -- say when my wife's washing her hair. So, tonight, I replaced the diverter stem, and ran the shower for almost 20 minutes. I thought I had solved the problem, but then after checking the room beneath the bathroom, I noticed a few drops of water. Not as bad as before, but there's still leaking from "somewhere." There's no access panel in the wall for the fixture. My only other solution would be to remove the tile and cut into the wall. Trying to avoid that, any ideas?