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