NEC Server 140Rc-4 - Manual (Page 302)

9-16 Upgrading Your Server
When inserting the server back into the rack, push the release levers on the rails on the sides of the
server to unlatch the server. Be very careful not to get your finger caught in doing so.
IMPORTANT: Push the release lever using a screwdriver or the like.
Pushing the lever with your finger may hurt your finger.
Release lever