Performed precision AC tune up. Checked operating refrigerant pressures to ensure peak performance and efficiency. Tested power distribution system and corresponding starting components. Verified proper temperature differential across indoor coil. Checked running amp draw; optimal. Replaced filters inside return grills. Used alkaline treatment to reduce bacterial growth within primary drain line. Washed outdoor coils thoroughly to maintain heat rejection. All checks are good at this time. System is currently operating within desirable specifications