Customer stated moan flo sense valve was showing possible slow leak. Performed inspection and could not see any visible leaks via dripping faucets or running toilets. Performed pressure test and system was loosing pressure indicating a small leak. Recommend crawling under home and performing inspecting to see if there are any leaks under home. Crawled under home and found that customer had leak on their cpvc water line. Removed section and plumbed in new section.