Hi,
I still believe that it is the electrical spacer / connection. However if the area below the connection is dry it must be the sump gasket.
Both are easy straightforward jobs taking usual care to avoid dirt ingress.
All you need to consider is how much fluid to put back. I choose to measure the oil removed = 3 litres. I did not drain the torque converter.
I subsequently checked the oil level by making an appropriate dipstick.
If you are convinced it is the sump gasket that is leaking you should examine the surface on the pan and the casting in the area of the leak to ensure no damage / imperfection.
The sump gasket is a rubber trype material and its sealing properties are quite robust.
Good luck.
Stuart