AC precision tune up. Clean and tune up AC; cleaned condenser coil, checked all outdoor electrical components, tested indoor air flow, checked refrigerant levels, and tested overall AC operation. Found a restriction in the refrigerant this will cause excessive damage to the compressor and lead to failure of the system. Also this will decrease cooling performance, and lastly the efficiency of this unit is not up to code and should be replaced in the near future. All recommendations declined at this time.