Tech arrived and confirmed that system is very low on refrigerant. Swept indoor coil and confirmed aluminum coil is leaking near the bottom left corner closest to drain pan. Customer approved replacing warranty coil and 2 system yearly Premium maintenance. First visit in 6 months. One of three flex duct return lines is collapsed in attic. Customer has already spoken to Bryce about duct replacement. He will follow up with Bryce about duct replacement in attic. Tech recovered remaining refrigerant and flowed nitrogen while brazing in new indoor coil and billow filter drier. Pressure tested system to 200 psi. Passed positive pressure test. Pulled vacuum to 270 microns. System passed standing vacuum test. Recharged system with 7 lbs 5 oz nameplate charge plus 15 oz for 40 about foot line set. Total charge is 8 lbs 4 oz. Tested in each mode without issues.