Performed tuneup on AC system. Cleaned indoor and outdoor coils, flushed drain line, replaced air filter, inspected blower wheel, checked temperatures, checked static pressure, checked refrigerant pressures, inspected all major and minor electrical components. Found a 6 inch return flex in closet torn and leaking air, also found biological growth inside air handler, and compressor has high startup amps. Gave client solutions for issues with system. Client decided to go with replacing damaged duct, installed a 24 V UV lamp system to eliminate the biological growth, and installed hard start kit to reduce compressor start up amps. Scheduled for install to come out tomorrow, October 7 to make duct repair. Client paid in full. Cycled and tested system, all operations are OK at this time.