I'm going through something similar but an electrical connector is leaking. Wasn't happening until a few weeks after a fluid change. My wild ass guess is that the small crack in the gasket was full of debris and the new fluid has cleaned it out.
I installed my yesterday. I didn't notice any difference in capacity. I'll double check the fluid level when I get home this afternoon.
I also installed the dipstick from Mike's build shop. Makes it so much easier to check level and add fluid.