Customer signed ach form for the upstairs and main floor systems. Customer recently replaced both 16x20x5 media filters. Main floor outdoor unit has a bad condenser fan motor. Upstairs unit was frozen, after unit thawed and coil cleaned I found the unit low on refrigerant. I estimated 2 pounds low of 410a. I completed two system cooling maintenance. Checked all electrical components,cleared drain lines,cleaned coils on both units and checked charge on upstairs unit. I will get with the supply house Monday for condenser fan motor availability and will send an estimate for labor on fan motor and leak search options. Customer got one pound for free being a maintenance member.