I spoke with homeowner who said his AC just hasn’t been cooling properly. I went through the unit and noticed the liquid line was extremely hot. Went outside and found that the condenser coil was extremely matted over with dirt and dust. I cleaned the outdoor condenser coil and ensured there was no longer an airflow restriction and started up the system. Added in 3# of R-410A refrigerant into the system to achieve a 12°SC, matching the manufacturer requirements. Everything is working at this time.