To remove the On-Off-Pushbutton on the Side you must remove the Rubber-Foot on the Pushbutton-Side, then with a Little Allen-Key (Imbusschlüssel 0,05) remove the little Ground-Screw, then with the same Allen-Key loosen the Grub-Screw (Madenschraube) under the Ground-Screw (These are the Grond-Connection for the Push-Button)

Next remove the lower Panel like in Step 4. and desolder the 4 Wires (Step 9) from the Logic Board.

Now you can press out the Push-Button with a Long Stick from the Batteries Side and repair.

Norbert