Today on this visit I looked at both systems in cooling. Down stairs tests in tolerance for functionality. It does have a contactor buzzing and needs be replaced. Additionally adding a soft start will help improve longevity for the contactor compressor and capacitor. Deltas 72 return supply 48 Upstairs system is low on 410a. System super heat is 57 and subcool is 2. Deltas 72 return supply 65