I have a 40ish year old shower with a diverter valve between the hot and cold stems. It is a central system (10 ce 3 bath stem). I had a leaking bath tub. When i ran the shower, water would come out the bath tub spout and the hot water stem. I replaced the valve stems for hot and cold. That resolved the water flow out of the valve stems. I replaced the valve stem with a central (11 ce 3 diverter stem). I have eliminated the flow of water out of the bath tub while shower is running, but noe there is a steady trickle out of the shower head while the bath is running. Any ideas?