Found first floor system sub cooling superheat to be over 30°. Found TXB not to be working properly. The system is our 22 and we can no longer get parts. System must be replaced. Ultimate Cooling Tune-Up: cleaned coils, brushed and cleaned traps, added pan treatment tablets to pan. tested and checked all controls, wiring connections. tested temperatures, checked filters. checked refrigerant temperature and pressures, tested static duct pressure. tested blower operation, tested cooling operation to ensure working within manufacturer specifications.