Ac maintenance in Suwanee, Georgia. Three systems. Upstairs system not cooling. Found burnt wire going to compressor. Found pitted main electrical switch. Due to age and condition of upstairs system, recommend upgrading system to a more reliable and more efficient system. Set up consultation for customer. Recommend adding additional ductwork to upstairs system with install to reduce high static pressure. Changed upstairs and main level filters. Cleaned washable basement filter. Found basement blower capacitor to be weak (7.5 mfd). Basement dual capacitor is completely non functional (35/5 mfd). Basement main electrical switch has electrical pitting/ burning present. Replaced basement dual capacitor. Main level and basement systems are cooling at this time.