I have hot water leaking from my shower/tub faucet. It is a 3 handle faucet and the leak comes out of the spigot. There is no leak at the handle. What could be the issue? Is it the hot water handle or the middle selector handle? How do i go about fixing it? I have lived in my house for 5 years and have no idea what brand the fixtures are, no brand name anywhere. Please help!!