Replaced damper control. Replacement was easy after watching the process in an Appliancepartspros how-to video. It took just a few minutes to pry off the vent cover, and remove the following items: the two screws holding the panel in front of the damper control, the panel itself, and finally the damper control assembly. After unplugging the damper control, reverse the process to reassemble it. Damper now operates quietly.