Performed annual inspection. No crawlspace. All fixtures were temping appropriately. Flushed tankless water heater with a vinegar solution. Turned off water inlets and outlets to unit. Turned off tankless water heater. Turned off gas. Performed flush and turned water back on to unit. Made sure water was hot before leaving property. Customer informed me toilet in upstairs bathroom was leaking. Pricing was given to pull and reset toilet along with replacing emergency shut off valves for fixtures.