Fujitsu PRIMERGY RX4770 M6, Upgrade And Maintenance Manual, Page: 21 / 468

If the defective component is a customer replaceable unit included in the CSS
concept (Customer Self Service), the CSS indicator on the server front will light
up.
It is recommended to prepare local maintenance tasks using remote
diagnostics procedures, see the "ServerView Suite Local Service Concept
(LSC)" manual.
2.2 Classification of procedures
2.2.1 Assignment of unit categories
The complexity of maintenance procedures varies significantly. Procedures
have been assigned to one of three unit categories, indicating the level of
difficulty and required qualification.
At the beginning of each procedure, the involved unit category is indicated by
one of the symbols introduced in this section.
Please ask your local Fujitsu service center for more information.
2.2.2 Customer Replaceable Units (CRU)
Customer Replaceable Units (CRU)
Customer Replaceable Units are intended for customer self service and may
be installed or replaced as hot-plug components during operation.
Components that the customer is entitled to replace may differ
according to the service form in his country.
For Japan:
https://www.fujitsu.com/jp/products/computing/servers/primergy/support/
repair.html
Before you start
RX4770 M6 Upgrade and Maintenance Manual 21