I have an Arcoaire furnace,RPJ 2, Model GNJ075N12C1, Serial #L9707 50638, works fine except has developed noise, I guess from fan-forced heat blower, when it shuts down, it sounds like the squirrel cage is beginning to hit on the housing making a jingle bell sound--I'm guessing the bearings are going out on the squirrel cage blower. no noticeable noise when the blower is operating, just when the squirrel cage is coasting to a stop. any suggestions? ("get it fixed!" probably :0)