Anybody know what could be causing trans fluid build up on top of transmission? Backstory: Brought 2007 4 cylinder to the dealer for 120,000 mile trans flush. I also asked to change the filter because after 120,000 I don't like just a flush. They put some crappy pan gasket and it started leaking so I brought it back and they put the Toyota gasket and it stopped leaking. I later noticed more trans fluid at the bottom while changing the oil cleaned that up but traced the leak back to the top of transmission. I have taken it back to the dealer twice for this issue and they say it's not coming from the overflow tube cause they took it off and went for a test drive and nothing came out. I have cleaned it spotless and check it regularly. I notice that it does not leak with everyday driving, but it leaks when I drive it hard. Example; thought I lost my wallet at work so I was racing back to find it before someone else might find it. I took off hard, tires squealing, double downshift getting on highway. I checked it when I got back home and the little puddle of trans fluid was on top of the transmission right under the starter and to the right of the starter. I know that getting on the transmission like that increases pressure in the transmission, but what could be leaking?