Customer called us out for a tub drain in the upstairs hall bathroom that was draining when stopped up. We tested and examined the drain and found that spots of corrosion were causing it to have a slight gap allowing the tub to drain. We recommended replacing the drain and overflow cover and the customer agreed. We removed the old drain and over flow. Put putty around the new drain and installed them both. Tested throughly. Cleaned up area. Customer is satisfied.