You can guess at what your issue is or diagnose a litter before yanking it apart. Pull the inspection shield - spray some brake kleen or carb clean inside the bell housing and dry it out reall good. Reach in as far as you can and dry the back side of the converter if it is wet. Then start it up and let it run in park. If no leaks after a while shut it off and let is set for ten or fifteen minutes and check again. If dry start it back up and run it in neutral for ten minutes then again shut it off and check again. If no leaks you can take it for a short drive but keep the engine speed low, come back and check the bell again for wetness. If dry - you're lucky and likely just the fluid burped from the vent. If the converter backside is wet then you have a converter hub crack - not very common. If the bell is wet and the converter is dry you have either a leaking pump seal to the converter (impeller hub seal) or a leaking pump to case gasket/perimeter seal or a leaking pump bolt/washer (again not too common but I have seen leaking gaskets when the bolt is under torqued. Most of this diagnosis is in the service manual.