HP EXPANSION BASE 344524-001 - Manual (Page 42)

Removal and Replacement Procedures
Maintenance and Service Guide 5–13
8. Swing the top left edge of the system board clockwise 1 until
the audio connector 2 disengages from the hole 3 in the base
enclosure.
9. Remove the system board from the base enclosure 4.
Removing the system board
Reverse the above procedure to install the system board.