Sch 10 para 36
When the documentation process is applied to the maintenance development function, the traceability of at least the following elements needs to be guaranteed— (a) the documentation relating to the development, assessment, validation and approval of a substitution in the course of maintenance; (b) the configuration of vehicles, including, but not limited to, components related to safety; (c) records of the maintenance performed; (d) results of studies concerning return on experience; (e) all the successive versions of the maintenance file, including risk assessment; (f) reports on the competence and supervision of maintenance delivery and fleet maintenance management; (g) technical information to be provided to support keepers, railway undertakings and infrastructure managers.