Dell OptiPlex 5070 Small Form Factor Service Manual page 60

7. To remove the screws from the system board:
a) Remove the 5 screws that secure the system board to the chassis [1].
b) Remove the single screw used as a mounting point for M.2 SSD drive [2] and the standoff single (#6-32) screw [3] that secures
the system board to the system [3].
60 Removing and installing components