4.2.1.5 Defect notification on Equipment in the depot which requires Supplier support:Any Supplier's repair shall be supported with a detailed report of failure and the repair performed. In the case of retrofit, the Supplier shall provide a report indicating the work performed and tested with the appropriate configuration update.4.2.1.6 Configuration and retrofit managementThe supplier shall provide and support a configuration management system as described in section 3.8 throughout the Product Introduction [and Operations & Maintenance] phase, especially containing but not limited to:status of the design and product configuration as designed, as built (delivered) and as maintainedPart traceability including spare partsRetrofit approval by BT engineering and manage through FMI process as per section 3.8, with appropriate update documents for any changes implementation4.2.1.7 RAMS Performance and Quality PerformanceSafety