Would be interesting to know if there was a fault code for the transmission. The transmission will point to the temperature sensor (in the transmission) if it has an issue. It's a bit tedious to do, but getting a sample of the fluid would be nice. You don't need much at all. Just a visual inspection. If the fluid is black, time to change it. At 44k it should not be, but you never know how the other person drove it. At 44k your transmission is young. Look at my other posts to see what I did with my transmission.