Performed leak detection to customers hot water lines. Opened drywall behind washer machine, under water heater and under right vanity sink to expose manifolds to perform testing. It appears leak is located on hot 1/2” copper line that feeds the washer machine. Due to the other end of the manifold being located in an inaccessible area I was able to confirm for certain that this line was the line that was leaking. There is a slight chance that it could be the 3/4” copper line that feeds the master bathroom. Explained that we will have to remove water heater in order to gain access to the hot manifold and cap off lines to be certain which line is leaking. Will send customers two estimates. One estimate for if the leak is on the half inch line feeding the washer. And a separate estimate for if the leak is on then3/4” line feeding the master bathroom