Very good video. Mine was very similar sounding. Ended out being a mouse who went for a ride causing the blower to be unbalanced. Mouse didn't make it. Removed the blower housing, cleared the mouse, cleaned, and reinstalled. I checked the bearings on mine before cleaning and they were fine. Blower works as it should now. Thanks for the video to fast track my repair. Saved me some money as I didn't have to pay someone to resolve this.