How to use error codesUse the error codes displayed on the screen to diagnose failures. If more than one error code is displayed,begin the diagnosis with the first error code. Whatever causes the first error code might also cause false errorcodes. If no error code is displayed, see whether the error symptom is listed in the “Symptom-to-FRU Index”section.Strategy for replacing FRUs for CTO, special-bid, and standard modelsThis topic provides information about the model types and FRU identification.Product definitionThis topic introduces different model types and how to identify each type.Dynamic Configure To Order (CTO) modelThis model provides the ability for a customer to configure a Lenovo solution from a Web site, and have thisconfiguration sent to fulfillment, where it is built and shipped directly to the customer. The machine label andeSupport will load these products as the 4-character MT, 4-character model, and 2-character country code.The model is “CTO1” and the default country code is “WW” (example: 20AACTO1WW).Special-bid modelThis model is a unique configuration that has been negotiated between Lenovo and the customer. A uniqueMTM consists of a 4-character MT, a 4-character model, and a numeric 2-character country code is providedto the customer to place orders (example: 20AA000955). The country code assigned is numeric and does notdesignate a specific country or region. The custom model factsheet for the MTM indicates which country thespecial-bid MTM is set up for. Special-bid offering is not generally announced.Standard modelStandard models (fixed configuration) are announced and offered to all customers. The MTM portion of themachine label consists of a 4-character MT, a 4-character model, and an alphabetic 2-character countrycode. The country code assigned is alphabetic and represents a designated country or region (example:20AA0009UK).FRU identificationTo identify FRUs for a product, do the following:1. Go to: https://support.lenovo.com/partslookup2. Type the Machine Type in the corresponding field to get a general FRU list, or type the Serial Number formore detailed FRU information.28 P360 Tower Hardware Maintenance Manual