I pulled the pan off my tranny to drain before dropping the tranny. When I took the pan off, I found a part in it! The part looks like it is white nylon, about 1" round, domed, with an o-ring, and has about an 1/8" diameter by 2" long stem. I don't see anyplace it could have came from. What is it and what does it do? I just lost OD and burnt the fluid all of a sudden. Would this have something to do with it? Could it maybe be fixed without dropping and run?