Great suggestion about the baby powder, however, when was the last time that you bought any baby powder? After Johnson & Johnson got sued and lost, with the claim that baby powder caused cancer in woman, they pulled the product. I used to use it for installation of tubed tires as a dry lubricant, and I have not been able to find it anywhere. A friend that is a diver, said that getting talc has gotten very difficult, and expensive. He uses it with his dive suit.Baby powder works well to find/track down tiny leaks from cracks or imperfections that can't be seen by eye. First clean the part well with some solvent, dry it off, and then sprinkle the suspected leak area with the powder. You'll soon see where the powder is getting dampened from the leaking fluid. If it isn't obvious when you remove the gearbox, this might be a way to find your trouble spot. Good luck!!