I was finally able to get the car into the dealer yesterday (service closes at 5:00) to have them diagnose the problem. They just called and let me know that the master switch needs to be replaced. Because the passenger's side controls work, they know it isn't the motor. They had to order the part out of Denver, so the car should be ready to go by Thursday. He also said that the car is under their 30-day dealer warranty, so this won't cost me anything.
He said they do their best to inspect the cars before they sell them, so the 30-day warranty is a way of helping him sleep well at night by knowing that his customers are being taken care. I like that kind of attitude!