The first time I drained the gearbox, the oil was greenish brown which must be water mixing with the oil. About 1,000 miles later, I checked it again and it is getting water and mixing with the gear oil once again. What is the fix to keep water out of the gearbox? How do I locate the vent tube assuming this is the culprit. I thought that maybe when I was washing it that water was entering somehow. I checked the air filter box for condensation but it is bone dry. Help!