05/27/2025- I arrived on site to find old mastic tape to be loose, causing an airflow leak in the closet where the air handler is located. I have patched up and resecured the air flow leak. The unit is working properly and cooling properly, however I noticed that the 20x20x1 return filter grille is extremely rusted and should be replaced. I have discussed this with the customer and have emailed her an estimate to replace the rusted filter grille. However the unit is cooling properly at the time of service.