I picked my car up from the shop yesterday, without a Tiptronic service. The mechanic pulled the fill plug and got a chance to see and smell the fluid. He said it was not contaminated with diff lube in the same way he's seen in a different car. He recommended I think twice about a full service because he couldn't recreate the 0740 code and the car acted normally in his view. I was still inclined to go ahead and do it but he told me it would cost over $500 to pull the pan and replace the fluid. That's a lot of money and I'm thinking I could do it myself and save $350.
The only thing that worries me a little about DIY is removing the braces and pan that have to come off to reach the pan itself.
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