My A6 c7 2013 2.0t has a coolant leak. I was coming from general area near water pump. I went ahead and replaced the pump itself and did a pressure test. It still leaks... from the looks of it it was not a pump but from something underneath the pump. There is like a black plate that bolts to the engine righ under the pump. Anyone has an idea what it is and how can i fix it?

Thanks in advance!