After watching the AP video, decided to order and replace all four drum rollers. Best thing I did was first moving the drier out of the small laundry room and into the garage to give myself lots of room to work. Upon disassembly noted a big lint clump inside the fan itself! Removed the clump and totally vacuumed the dust, debris and lint from all the internal working components. Reassembled and reinstalled the drier. Now runs quieter than ever and my daughter has a big smile! Thanks Appliance Pros!