Transmission leak advise

Unless you just like changing parts for fun there's only one way to do it. Dump a few extra quarts in it. Get under it at night and bring a flashlight and a roll of Bounty. Maybe a pillow too so your neck doesn't get a cramp in it...(Don't ASK!) Wipe off everything and WAIT. Wipe it all off AGAIN and wait. If you have to change the tube oring, then the fluid level will adjust itself. Otherwise you can remove the nss and it will adjust itself as well.