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The Tiptronic service basically means draining the fluid in the pan, dropping the pan, changing the filter and refilling the fluid, per the 101 projects book. Possibly draining and refilling a second time to get a more complete fluid replacement. I think it's supposed to be done at around 80k miles. My car displayed a CEL for a vacuum leak but there was a 0740 code too, which has to do with torque converter clutch operation. It shifted a little funny going up hills under light load when cold. Worked OK after it warmed up. I'm hoping the fluid replacement will fix it but it might need a new torque converter.
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