Original A904 Trans Factory Filter?

The tailshaft end is dry. The leak looks like its where the tailshaft is bolted to the gearbox area but can’t find the spot.

If it's a small leak they can be hard to find. Clean that area real good and get a can of Desenex foot powder SPRAY. Spray a bit on the trans where you suspect the leak is, let it dry, drive it, check it again.

It might show itself better.