HP ProLiant ML30 Gen10 Plus Maintenance And Service Manual page 54

If the server is in rack mode, remove the server from the rack .
5. Remove the access panel .
6. If installed, remove all media drives .
7. Remove all power supplies .
8. Disconnect the RPS cables .
9. Remove the RPS cage.
10. Remove the power distribution board.
HPE ProLiant ML30 Gen10 Plus Server Maintenance and Service Guide 54