We were told by our dealership, after having the fluids checked on a recent oil change, that our transmission fluid needed to be "flushed" and changed. The previous owner was a landscape business and may have done some towing, so we agreed to do it. The van had 71,000 miles on it at the time. They put 12 quarts of transmission fluid in according to the bill. About a week after this service, the "Check AWD system and check engine" light came on, and it was not shifting correctly. We brought it back, and they stated that the "Transmission Computer Assembly" needed to be replaced. So $1,300 later it was replaced. Two weeks after that, the same warning happened, and the same shifting problem. We limped back, and after waiting a week, they concluded that they had overfilled it with fluid by 5 quarts when the system was flushed. I am getting mixed messages between the google searches I have done on this, and the capacities listed in the manual. The manual says the capacity should be 7.1 quarts, searches say may be "more than 10 quarts". I want to know if this $1,300 assembly failure was due to overfilling the fluid. Any advise would be appreciated.