On arrival both systems running and cooling. Downstairs unit made 20 delta upstairs 14. Indoor units dusty and evaporator coils corroded. Outdoor units passed all electrical testing. Upstairs system low on refridgerant with a 2-3 degree subcool with a 38 superheat. Downstairs system had normal refridgerant levels. Recommended speaking to a comfort advisor about replacing upstairs system, he's gonna wait till it quits and replace it at that time. Systems cooling as I left, thanks for choosing comfort experts and have a great day!