Thanks people.
This is exaclty what I did.
A larger pan and untied few bolts of the tranny oil pan.
Few minute later I was able to detach the whole pan.
My estimate is that there were about 2 to 2.5 liters of oil in the tranny pan.
I did not bother with the stripped drain plug since I can change the fluid this way.
I believe that the drain plug was never opened (black paint was not cracked).
They must have been take the whole pan out directly every single time.
thanks
ACM