Help leaky tranny

dipstick seal leaks when car is off as the trans fluid drains from the convertor back into the pan. let it idle for 30 minutes over a clean spot of driveway and see if the leak is there afterwords. Sector shaft seal is on the driver side passenger side also has that pin the kickdown lever rides on that is exposed and O-ringed that sometimes leaks. You can also get some UV dye and a UV flashlight (in a kit at autozone) and get under there at night and start looking. I would guess the dipstick or sector shaft. and those are the easiest after a poan gasket or a leaky fitting.