Upon arrival replaced media air filter. Found that the water heater drain and the pressure relief were both dripping slowly. Attempted to drain water heater down via the drain and could not due to a sediment blockage internally. After getting customer approval we replaced the drain and drained the water heater. We then replaced the pressure relief valve and flushed the water heater to remove sediment. Filled water heater back up and started the water heater. Unit is working properly.