I've not done that repair. Your vent must be on the other side. What I can tell you is on mine, I would get seepage from the vent itself. I think from the factory they just fill with the hydro oil. After I changed the oil (GL4 SAE 80W), I didn't have an issue. Mine, I would clean up and monitor the level. Always check it cold and level. An actual leak on a front axle VS a minor seepage would be where I would get some parts and repair. Or if in question, change the oil. It takes ~ 3 liters.