Whenever a product covered by the 'On-site repair' service develops a fault, the customer should contact the Lexmark Technical Support Center (TSC) and provide the serial number of the equipment. Lexmark will validate that the warranty, or service contract, is current for the product concerned. The TSC will follow a troubleshooting process with the customer in an effort to determine the problem. If the TSC determines that a service action is required and the product is entitled to On-Site Repair Services, and once Lexmark has received the service action request template properly filled in and signed by the customer, Lexmark will dispatch a Lexmark Authorized Technician to the customer's designated location with a set of recommended parts. The technician will complete the repair and confirm the repair with the customer.