Is the dent a sharp one with a crease, or a gentle depression? The reason I ask is have learned how to shrink metal when working on my cars, and generally if the metal is creased it is much more difficult to remove the dent. The methods that I use on the cars would not be suitable for the finish of a stainless steel appliance. You might be able to try higher heat, with an electric paint gun, but this may cause problems with insulation or plastic parts located near the dent. Also, did you have too much material between the dry ice and the stainless steel? Did you allow too much time between the application of the heat and then the dry ice?
Hope this helps.
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