Recovered the refrigerant back into the condenser. Removed and replaced the upstairs Fujitsu indoor unit in the front bedroom. Pressure tested and evacuated the system. Opened the valves and released the refrigerant back into the system. Started and adjusted the charge. Checked the indoor temps in cool mode- 52-54* at all units. System is operating properly. The blower wheels on the remaining 3 units are dirty. Recommend having the wheels and coils cleaned to help provide better airflow.