Upon arrival, customer advise that she needed to partake in a zoom call that would run roughly 2 hours. She approved for me to proceed with the maintenance and email the summary upon completion as she would not be available to go over. I performed a Maintenance tuneup to include rinsing the outdoor coil, inspecting the indoor coil, checking all electrical components, flushing the drain line, and checking the refrigerant level. The system is low on refrigerant by about 2-3 lbs. the evaporator coil and blower wheel is heavily impacted and the coil is rusted. I have provided customer with and