Performed tuneup on AC system. Cleaned indoor and outdoor coils, flushed drain line, checked air filter, inspected blower wheel, checked temperatures, checked static pressure, checked refrigerant pressures, inspected all major and minor electrical components. Found biological growth buildup on outside of supply Plenum as well as inside air handler, system is low on refrigerant, which means there is a leak somewhere in system, outdoor capacitor is very weak, and compressor has high startup amps. Give client solutions for issues with system. Clients main concern is the growth buildup on system. They would like to discuss with each other and will get back to us when they decide to move forward. Also offered elite membership. System is running and operating at this time.