Upon receiving a call about a malfunctioning KitchenAid refrigerator, I began by diagnosing the issue. The service light was illuminated, indicating a problem. I accessed the refrigerator's main control board, carefully removed the old board, and installed a new one. This involved precise wiring and ensuring all connections were secure. After the replacement, I tested the refrigerator to confirm the service light was off and the unit was functioning correctly. The refrigerator was restored to optimal performance, ensuring the customer's satisfaction.