Dispatched to investigate the reason why downstairs was not getting airflow. Upon arrival I spoke with Mark and he informed me that it’s a zone system. It’s a two-story home with one system in it. The downstairs mechanical damper was not replaced on the installation two years ago. It was not responding to power open or spring closed. I am leaving an estimate to replace 1~16” inch zone damper and rewire it to power open and power close.