leak tub faucet valve

Looking for repair info on: 'horizon comfort zone' This is actually a bathtub faucet in an older hotel. I cannot find anything on the faucet but 'comfort zone'. the Horizon is the only thing I can find doing a google search. Need repair info, parts info, where to get parts info. Here is a pic...

I replaced the hot, cold and diverter valves and replaced all the seats and I still have water leaking. I turn the handles as tightly as possible and it doesn't help. Should I have used pipe thread on the seats? Or some pipe dope? Any help is greatly appreciated. Also, the outside shut off valve...