Question for Saturntech9: My warning.

Question for Saturntech9:
My warning light came on my car Saturday with the wrench. Checked the manual and it said it was a non-emission problem. Once the light went out (when I shut the car down) it never came back on again. I did notice, or thought I noticed, a jerk with it shifted out of first gear once or twice when the light first came on. Did not notice anything after that. I took it in for a check and after putting it on the machine to check codes, etc, they said it looked like it was not shifting properly. No final diagnosis yet. They will call back shortly, but said it looked like a transmission problem. My car only has 40,000 miles on it. Would there be an GM warrantly on the transmission with so few miles? I can't believe it might need to be replaced. I had the transmission fluid changed I believe last November. I talked to you about that and what kind of fluid to use, etc. The name used was Billington. What do you think? Thanks.