We have a 1930s Am. Std. tub valve (separate hot and cold sides). A while ago we noticed a drip at the outside wall in the basement, under the tub. We believe that the problem is in the hot water supply side. We took apart both valves, replaced the washers (even though there was no drip at the spout), got rid of any calcification that we could see, repacked the stems and reinstalled. We still have the drip in the basement, although it has lessened. The escutcheons at the tile wall are off and we cannot see any leakage at the valve in the wall. Any suggestions as to how to proceed from the pros? Thanks for your help.