Introduction
Prereq to upper case guide—remove the I/O board after the logic board
Tools
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Remove the small rubber gasket from the corner of the upper case nearest the the I/O board.
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Remove the gasket from the corner nearest display cable connector.
 
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Use the tip of a spudger to carefully flip up the retaining flap on the microphone cable ZIF socket.
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With a pair of tweezers, pull the microphone ribbon cable straight out of its socket.
 
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Use the tip of a spudger to pry under the speaker cable near the connector, lifting it straight up from its socket.
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De-route the cable from its notch in the logic board.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.