A component of existing ICT (procured, maintained or used on or before 18 January 2018) that met the original 508 standards (republished as Appendix D) and has not been altered on or after 18 January 2018 need not be modified; any alteration brings the altered component under the Revised 508 Standards.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.