Engine codes are no worries as typical for chipped car and as 4everRS said that is the max Group 3 will show for the MAF. The bad news is that the chipping may have increased your power enough to over strain your current tranny or T.C. Have you ever done Vagcom logs under full boost runs prior to chipping? I was able to get over 2000mb with my car with Revo (using the SPS select tool) and getting no tranny codes ( had my spare tranny & T.C. Rebuilt anyways while the engine/tranny were out of the car). My car only had half the mileage on the tranny as yours, actually 67K. I will probably sell my original tranny to someone someday but would still recommend the buyer to have it rebuilt for the fact that it's too much work pulling one and reinstalling. I would clear the codes and do another run or two but definitely run logs 3, 31, & 115 without the car being real hot but fully warmed and see what re-appears. You know that 145K is getting high for the tranny even though the engine has a way to go.