I have no water pressure (hot or cold) in the bathtub of one of the bathrooms in the second level of my home. I have pressure in every other faucet in my home except for that one bathtub/shower. The sink and toilet located in the same bathroom work fine. The bathtub faucet just stopped working one day with no signs of low pressure etc. There is no noise from the pipes when the faucet handle is pulled to turn on the water. What could be the problem?