I arrived at the client's home to perform gas furnace maintenance. I completed the checklist and found that the unit was working properly. I tested the thermostat, checked the air filter, and cleaned the burners. I also checked the gas pressure and adjusted it as needed. I also checked the electrical connections and replaced any worn or damaged parts. Finally, I tested the unit again to ensure that it was working properly. The client was very satisfied with the work and thanked me for my professionalism and attention to detail.