After doing a little research on their own, our customer figured out that the hissing noise they heard all night was due to a pin hole leak somewhere in their pressurized plumbing system. Since they didn’t find any damage, they assumed it was a slab leak. That’s when they reached out to us here at Pegasus Leak Detection! We were able to come out to their residence in Thousand Oaks the same day and locate exactly where that leak was for accurate repair. We are glad we can help.