Trans cooler???

I've read about some cooler or exchanger by the starter. My problem is the third "cooler" from the front of the truck. It has red fluid so I am thinking trams cooler. The part number on it (52028915AE) if you google it says trans cooler. Most folks speak of the lines leaking. Is there a way to find out exactly where the leak is coming from without taking the entire front apart?

Is there a better cooler than the stocker, if so is it worth it or just stay with the OEM

Thanks in advance