Homeowner had a pinhole leak on a 3/4” copper water line. Removed Sheetrock and found the pinhole leak. Homeowner also had a failed expansion tank on the water heater. Cut out approximately 6” of copper on either side of the pinhole and replaced with new type M copper and two propress couplings. Removed failed expansion tank. Installed mounting bracket for expansion tank. Mounted expansion tank and ran approximately 3’ of new type M copper to expansion tank. Homeowner had two multi turn stop valves under master bathroom lavatory. Gave homeowner option to replace stop valves, but customer opted not to. Tightened packing nut on stop valves under master bath lavatory. Advised homeowner that this is not a fix and the stop valves should be replaced soon.