can you "see" residue of a fluid leak on the ground? Is it red in color?
It is possible that the need of a repair caused a build up of fluid and dirt over the years and they may have repaired a leak, but due to the "mess" it created they may have missed another area that needed repair. I would double check to see if indeed it is transmission oil or if you are experiencing this smoke and smell from another area of the vehicle.
As vehicle's get older and leaks develop, sometimes it's hard to see exactly what is leaking. If you have had your vehicle back a couple times for the same problem and you still have a leak, you may want to consider taking it somewhere else.
Find a shop or dealership that can show you exactly what's leaking and how it can be repaired. You don't want a problem to develop from the fluid getting too low.
Here's a site that will help you find certified shops in your area:
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〉 Answered on Aug 20th, 2007 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines