Performed precision AC tune up. Checked operating refrigerant pressures. Found system low on refrigerant. Determined this was result of leak present inside evaporator coil upstairs. Preferred to add refrigerant and make corrections at later time. Adjusted refrigerant charge accordingly to ensure peak performance and efficiency. Tested power distribution system and corresponding starting components. Verified proper amp draw; optimal. Used alkaline treatment to reduce bacterial growth within primary drain line. Washed outdoor coils thoroughly to maintain heat rejection. System currently operating to best of its ability with existing condition. Provided 10% price reduction for military/first responder discount on additional refrigerant