Introduction
If your power switch is damaged the best option may be to replace it.
Tools
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            Identify and unscrew the ten PH000 screws around the top, front, left, and right sides of the camera body. 
 
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            Slowly separate the back case from the camera. 
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            Idenify and unscrew the two PH000 screws connecting the power switch. 
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            Remove the power switch. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
13 screws in total
plus 3 for the side cover
Alphons Hermans -