We replaced the pipe that takes the hot water from the water heater tank and had no problem. While doing that we noticed the t&p valve and instructions to open it once a year. Bought the house new 7 years ago and had never done this. We opened the valve and after that we have very low water pressure in the kitchen only the baths are fine. The kitchen is the closest fixture to the water heater. Should we replace the t&p valve or is there some other reason for the low pressure. After opening the t&p it took about a day for it to stop dripping but it finally stopped. Any suggestion welcomed!