I have a 2016 Enclave. The transmission begins to slip when going from second to third. Luckily it’s still under the power train warranty and was told that the transmission valve body needs to be replaced. Was wondering if this is one of the well-known problems for the Enclave? Anything else down the road to look for? Currently I’m at about 65k miles and the power train warranty isn’t over till the next 5k miles. Thanks!