Help! Last week, I had to replace several of the parts of a toilet in one of my bathrooms to fix a leak. The leak is gone, but, we ran into a problem this morning. My wife went to turn on the shower in that same bathroom and no water will come out of the shower or bathtub. The only thing coming out is a VERY small but steady stream from the faucet. The shower/tub is a single combination unit, and the house is only 5 years old. Any ideas what could have caused this?