Arrived on site to perform AC maintenance on 2014 condensing unit. Upon arrival homeowner stated that system has been working fine and has no questions at this time. Performed deep cleaning and electrical check on unit. Electrical components checked out properly although refrigerant pressures were looking abnormal. Charge system up with approximately 1 pound of refrigerant system did not react properly due to thermal expansion valve having restriction. Advised client TXV will need to be replaced and she will be available June 10 for the repair. Upon departure system is operational.