At 90k I wouldn't be overly concerned about having 2 transmission fluid changes. That is about right per the maintenance schedule I believe.

It is highly recommended to NOT get a transmission flush. Just drop the pan, change filter and refill fluid to the correct level. That will exchange a good amount of the fluid.This recommendation is even stronger if the vehicle has a questionable maintenance history or the car is showing ANY shifting issues. DON'T FLUSH IT!