Arrived to do a dual system performance maintenance. Set each system for cooling. Measured each systems static pressure measured a temperature split between return and supply air. Went outside and verified refrigerant levels. Verified operation of all electronic and mechanical components. Found that the capacitor for the carrier system is failing. Rinsed coils free of debris. Went back inside and checked interior of the furnace for cleanliness. Spoke with homeowner about the system. With homeowners approval replaced the failing capacitor in the carrier unit. Air conditioning systems are operational at this time.