Came out to check mini split unit that wasn’t cooling. Customer had installed his own mini split and had us do the connections of the line set. Customer stated that the system wasn’t cooling properly and freezing up. I checked system over and found it low on refrigerant. Found leak on flare fitting that was in a tight area. Customer had me cut out a piece of drip edge to get to the flare fitting easier. Refastened flare fitting, pulled vacuum, added refrigerant and tested system operation to verify it was cooling properly. System is now cooling.