For today, I was checking in the system that wasn’t cooling efficiently. When I arrived, it was definitely low on refrigerant so I added refrigerant with UV seal. I also added refrigerant line caps and cleaned out the unit. All levels on refrigerant and temperature split now look good and with the UV dye in there we will know if there’s a leak if the system falls behind again we can come look for it. Ended up adding nearly 3 pounds of refrigerant.