Performed tuneup on AC system. Inspected 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 inside air handler and in drain, There is no surge protector on indoor or outdoor units, outdoor contactor is burnt and pitted, and compressor has high startup amps. Gave client solutions for issues with system. Client is going to be having some electrical work done and wants to address all these issues on next service visit in 6 months. Cycled AC, all operations OK at this time.