Two system A/C preventative maintenance check complete. Changed filters. Tested mechanical and electrical components. Found weak blower capacitor in main level system. Found burnt main electrical switch in upstairs system. Found dead capacitor in upstairs system. Found weak capacitor in main level system and burning present on main electrical switch. Recommend repairs. Replaced main level blower capacitor and dual run capacitor. Replaced upstairs dual run capacitor and main electrical switch. Chemically washed condenser coils. Systems are cooling at this time.