Atwood furnace blower squeel

There's only one motor with a fan attached at each end. It's possible to remove the fans from the motor shaft and lube the motor bushings, but that is usually just a temporary fix. Eventually you'll likely need to replace the motor. Nearly all service work on the 8500 series furnaces can be performed from the outside without removing the furnace from the RV, including replacing the fan motor. A comprehensive Atwood/Hydroflame manual can be found here. Page 14 has instructions for removing/replacing the motor relative to a recall, but they work just as well for other motor service of course.