OPEN THE DETECTOR BOX
Carefully remove the sticky aluminum foil that covers the 2 little openings
between the box and its cover through which the red wires go into
the box. If there is aluminum foil at more places in the back of the box,
remove it too, EXCEPT THE 2 PIECES NEAREST THE CONNECTORS, in the lower
part of the box. Those will serve as strain relief.
Remove the box top cover, by removing the 6 little screws.
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