Customer called Joel earlier today because of a coil another company installed didn’t appear to be cooling. Joel added refrigerant to the system due to it being low on charge. The customer called a second time complaining about it not quite being cool in the house yet. I noticed that the airflow to the upstairs zone was weak. I cut open the duct and saw that the damper was shut when it was supposed to be open. I checked for 24V and got it. I believe the upstairs damper is failing. I propped some tape inside the damper to keep It open. Need another technician out tomorrow to take another look at the damper.