Repaired an air conditioning system by replacing the TXV (thermal expansion valve). Diagnosed restricted refrigerant flow causing poor cooling performance. Recovered the refrigerant and removed the faulty TXV. Installed a new TXV, ensuring proper fit and function. Pulled a vacuum on the system with a Robinair VacuMaster to eliminate moisture and air. Recharged the system with R-410A refrigerant. Verified efficient operation and optimal cooling performance after the repair.