I recently purchased a home that was built in 1991, equipped with a Trane XE60 furnace. From Tranes website, their is not any documentation...in fact, 0 records return when you search their site for XE60. This may sound premature, but as a result I will NOT replace this unit with a Trane. Now onto my question, the blower is making a cyclical noise when running suggesting that it needs lubrication. Does anyone know if this model has a self lubricating motor? belt driven? Any advice is greatly appreciated!