Performed maintenance on AC system. Cleaned indoor and outdoor coils, checked air filter, flushed drain line, inspected blower wheel, checked temperatures, checked static pressure, checked refrigerant pressures, inspected all major and minor electrical components, inspected ductwork. Found biological growth buildup inside ductwork as well as leaks in ductwork, found some biological growth inside air handler, outdoor capacitor was weak, compressor has high startup amps, and there is no surge protector on outdoor unit. Gave client solutions for issues with system. Could not get client approved for financing, client just went with Band-Aid solution for now. Replaced outdoor capacitor. Cycle and tested system, all operations OK at this time.