Air conditioner repair. No AC call. Found contactor had failed open and would not complete the electrical circuit. While doing a clean and check, I also found the system's cap was low and in a rusted condition. Replaced both the contactor and the cap. Used a 45/5 cap. Checked refrigerant levels. The system is in an adequate range. The system is now cooling and operating as it should be at this time. The customer just changed the furnace filter. The customer wanted to join our annual maintenance membership. She is using one visit now and will have fall prepaid.