Performed annual backflow prevention testing at commercial strip mall in Kinston. Inspected and tested 4 RPZ devices serving separate businesses. Device for restaurant failed initial test due to fouled check valve. Disassembled unit, cleaned all components, and replaced worn rubber components. Retested with satisfactory results. All devices now functioning properly with appropriate pressure readings. Test results recorded electronically and certificates will be emailed to property manager. Reminded maintenance staff about winter freeze protection measures. All work completed within scheduled timeframe with minimal disruption to businesses.