I recently did some remodeling and was required to move a gas line. Since then I think I can smell gas in one spot of the house. I had the gas company come out and they did their test at the meter and found nothing. They also used their sniffer and found nothing. I do have sensitive nose and think I need to pressure test the line to make sure I am not crazy. One of the lines in in the slab so I am hoping it is not coming from their. How does one pressure test a line?