It's not covered, not listed in the warranty book. The cooler is the radiator for the transmission, like the radiator is to the engine. The radiator is not considered part of the engine or a component of the engine. They are also not housed within the engine or transmission respectively. Therefore not part of the power train. Here's FCA's for the lifetime power train:
transmission case and all internal
parts; torque converter; drive/flex plate; transmis-
sion range switch; speed sensors; pressure
sensors; transmission control module; bell housing;
oil pan; seals and gaskets for listed components only.
That being said my '12 WK2 had 3 transmission failures (that's it in my avatar). I did not pay for the transmission cooler, nor can I recall it being replaced. I had 2 tranny rebuilds and last time it was replaced. They likely used the cooler I had. Maybe explains why I went through 3 of them. :lol:
So unless the cooler was leaking, they should not have replaced it. IF the transmission failure damaged it, then you can make an argument that a covered component damaged an uncovered component. I had the MAXCare Warranty too, but never had to pay the deductible on all 3 transmissions over the 90,000 miles I put on it.