HP ZBook 15u G3 Maintenance And Service Manual page 48

b. After you remove the PM2.5×5.0 screws (1), remove the 1 PM2.0×7.0 screw (2).
4. Pry up on the top (near the display hinge) of the bottom cover to disengage it from the computer.
Reverse the removal procedures to install the bottom cover.
NOTE: There are five different sizes of rubber plugs. Be sure that you reinstall them over the correct screws.
The rubber-plug sizes are as follows.
The rubber-plug locations for 15" computers are as follows.
38 Chapter 5 Removal and replacement procedures for Customer Self-Repair parts