Re: Hairy McScary - Power Shrift attempting 3rd to 1st downshift
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I would assume that the EGR also functions under tiptronic mode, but you say the car drives fine when using tiptronic. Sounds like the fault is within the mechatronic unit of the transmission ie it's a communication issue rather than a mechanical issue.
If your thinking of changing fluid, then most certainly also drop the transmission sump & inspect for debris & change the filter.
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