Insulation sagging off 2007 A3 firewall

Yesterday I noticed that the firewall insulation was sagging off the
bottom of a horizontal beam.  I took my car to the dealership to ask
them if any clips or panels had fallen off during normal use or had been
lost in recent recall repairs.

The service manager said that there's no clip.  He said the insulation
is supposed to be a rigid part but it has gone soft from water.  It does
in fact cover drain holes.  He suggested tape to fix it.

It seems odd that a car would have such a dumb problem.  I've Googled
for engine compartment pics but haven't found one that's clear on the
area.  I've put photos of mine online.  Does anyone have a 2007 A3 3.2
quattro to compare to?


There's an improvised clip in these photos.  Without it, the insulation
panel below the clip flops around.
http://www.pixelmemory.us/Misc/Sag/
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