During today's annual maintenance on a Carrier Infinity Series air conditioner, I discovered a refrigerant leak in the system. I repaired the leak, refilled the refrigerant to the manufacturer's specified levels, and replaced the air filters with high-efficiency particulate air (HEPA) filters. Additionally, I cleaned the coils and checked all electrical connections for safety and performance. This comprehensive service ensures the unit operates efficiently, extending its lifespan and maintaining optimal cooling performance.