I was hired to perform maintenance on a client's air conditioning unit. I arrived at the client's home and assessed the situation. I found that the unit was not cooling properly and that the condenser coil was dirty. I cleaned the coil and replaced the filter. I also checked the refrigerant levels and added more if necessary. I tested the unit to ensure it was cooling properly and made any necessary adjustments. I also cleaned the unit's exterior and replaced any damaged parts. The client was very pleased with the work I performed and thanked me for my help.