I just replaced my tub faucet since the previous diverter gate was cracked and would leak when the shower was on. It's not leaking from the faucet anymore but when i close the diverter gate to start the shower water leaks out from the back end of the faucet, btwn the faucet and the wall. It does not leak out of there when the diverter gate is open however. If I just run the water out of the faucet and do not close the gate to start the shower it seems fine. I wrapped treads with teflon tape before attaching the tub faucet but I have not caulked around the faucet. Do you think a little caulk would fix the problem or is it something bigger?