The AIWS cover can be clipped back into place without using any tools.
Procedure
Check that the AIWS is fully operating (green lamp) and can be browsed from the network.
Check that the cables are routed such that they will not be trapped when the cover is replaced.
Engage the cover with the top edge of the AIWS. Pivot the cover back into position, checking that the various plastic edges are in their original positions.