Customer had a leaking 40 gallon gas water heater. Also had a leaking 90 on copper piping and needed a gas shutoff for code compliance. Installed new 50 gallon gas water heater with a new pan, thermal expansion tank, and shutoff. Tested all work to ensure proper functioning and no leaks. None were found. Found another leak on another 90 near the courtesy repair. Charged a small fee to drain the water backing down and repair that section also. Tested all work after the repair and saw no other leaks.