I was called to a home to diagnose a no-cooling issue in a client's air conditioning system. Upon arrival, I performed a thorough inspection of the unit, checking for any signs of damage or wear. I also tested the thermostat and power supply to ensure they were functioning correctly. Afterward, I used specialized tools to measure the refrigerant levels and pressure in the system. Finally, I performed a leak detection test to identify any potential leaks that could be causing the cooling issue.