Typically this would be cause for a removal of the trans and re seal, unless it’s just the pan gasket.
Most shops won’t do just one leak, because it could come back in a week with another one.
“I just paid to have my leak fixed and it’s leaking again”
I’m sure you could see that happening.
It’s called an R&R and reaseal.
They take the trans out and replace all the seals, and usually the pump and tailshaft bushings as well.