Cooler was initially replaced for suspected leaks. Unit only had a little over 100k miles and was still within Cummins base engine warranty. When returned to Cummins, cooler was tested by Cummins and no leaks were found. Cooler was returned and claim for warranty repair was billed back to shop. Cooler is in perfect working condition with no internal coolant leaks. I will also include all gaskets, o rings and grommets used when replacing egr cooler