Tranny Leak

I have a 1996 Plymouth Grand Voyager SE 3.3 Liter Automatic it has 182,281 miles on it and I just had the tranny rebuilt. I got it back a week later and it's leaking from the black rubber seal, and the the bolt above it. I heard it might need a gromit seal? Is it fairly simple procedure or ? I plan on having him raise the vehicle and check out his work. Man, I wish I would have done that before leaving.:banghead: