What a bonehead dealer. TCU is on the left side of the trunk. Remove the left side trunk panel (where the nav system & cd changer (if you have it) are located). Look down. The TCU is the rectangular aluminum module, about 4" x 9" (rough estimate from memory). You'll need to remove the black plastic panel that is partially covering it (2 or 3 plastic screws). The TCU is fixed in that locatation with a bracket. You might be able to read the label without removing the bracket, but maybe not, don't remember. Should take you 15 minutes to find it. Get it and write it down in a safe place.

Look at the tip of the blue arrow in the picture. Ignore the red arrow.

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