Performed clean and check on two ac systems found unit 1 low on charge with service valve open and covered in oil balanced unit tested and inspected all electrical components and controls found unit two had a burnt connection on the herm side of the capacitor from a loose connection caused by a previous company checking the ac unit corrected with new wiring cycled units after repair and confirmed proper operation customer also needs filters as soon as possible as they have none in stock and current filters are clogged filters are 20x25x4