First I would ask you if whomever changed the fluid and filter knew the correct procedure for changing it and did they use a pressurized hose to remove the fluid from the torque convertor and replace the fluid in the torque convertor?
Yes there are many sensors connected to the Tiptronic including its own ECU. The Tip ECU has fuzzy logic meaning it can learn from your driving habits i.e. if you are the jack rabbit driver who likes to race between stop lights the ECU will change the shift rpm allowing the rpm to go to red line before shifting. Conversely if you like to piddle around town the ECU will respond by shifting quickly into 5th gear to maximize mpg.
There is a sensor at the base of the shift lever to tell the ECU the position of the lever and there is a sensor on the Tip whose purpose I can only guess at and that is to measure the temperature of the coolant.
Hope this helps.
