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3. From the left side, remove the cable that connects the module rack interface board and
the 8-slot module rack communication board. Then take off the SMR cover.
4. Unclench the two clips and take out the module rack interface board. Be sure not to
damage the snap slot on the left side.
5. Remove the cable that connects the 8-slot communication board and the LED board, the
LED indicator and the light tube.