Have the same problem with my 727. I think it’s the crush washers I didn’t change that bolt the front pump in. I looked at my old washers and didn’t know they were one use and reused them. Now when I fill my trans up it leaks. BUT once it gets about a qt low it stops. Sooooo since I have a +2qt trans pan I’m not super stressed about it BUT you might have the same washer problem I think I have.