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It definitely sounds like you have seals leaking in that gear box. It is not an extremely difficult job to replace the seals, you can most likely do it without removing the gear box from the deck. The drive shaft looks like it has a quick release collar on it that if you pull the outer collar back(it is spring loaded) it will allow the shaft to be slipped off of the input shaft on the gear box. This should give you access to the seal that is located there. There is a second seal just above the mower blade, you will need to remove the blade and a couple of washer to get access to that seal.