Customers water heater not lighting upon arrival. Customer stated he was doing the yearly service and after draining and trying to relight the water heater it would no longer light. Informed customer we could attempt to light it first. Gave customer estimate, customer approved estimate. After attempting to light found burner assembly not working properly. Informed customer we would need to call ao smith and have the parts shipped in since the water heater was under warranty. Have new gas control valve and burner assembly being shipped over night. Customer will call once the parts come in. Customer paid for us attempting to relight the water heater today. Informed customer that will be credited towards the cost when the new parts come in. Customer will pay $291.79 when we return to install the parts