Blue shield summer service. Homeowner recently replaced filters, I left replacement filters. Blower motor is an ECM motor, run capacitor not required, motor and wheel are clean, indoor coil is clean, condensate drain line is clear. Washed condenser coil, dual run capacitor tested good, contactor points are good, all electrical connections are tight. Checked operation and found system low on R-410A. With homeowner approval I added 2lbs R-410A. All amps and pressures are good. Required subcooling is 12 degrees +/- 3 degrees, actual subcooling is 10.5 degrees, superheat was 14.5 degrees, system is operating normally. I am not concerned about a leak, system was started up in winter time and was not topped off.