Arrived to do a performance maintenance. Set system for cooling. Measured the systems static pressure and measured a temperature split between return and supply air. Checked interior of the air handler for cleanliness. Went outside and verified refrigerant levels. Verified operation of all electronic and mechanical components. Found that the capacitors performance is failing and the contactor is pitted and charred. Rinsed coil free of debris. Spoke with homeowner about the system. With homeowners approval replaced the failing capacitor. Air conditioning system is operational at this time.