I have a couple similar separations on the outside of the front wall of the front shell, in the area around the front window. They total perhaps 2 square feet, and I too can push and flex the delam'd area.
I called the factory, and sent a couple photos. I wasn't particularly thrilled with the answer. It is on my Arizona computer, and I am in Maine, so I can't quote it, but in essense it said:
The aluminum has not delaminated from the foam. Instead, it may be a small delamination of the (strange word) layer which is bonded on the outside of the aluminum, and which provides the shiny, hard, easy-to-clean surface. The delamination is not a problem. We do not advise attempting to reglue.
The strange word was something like "kapton", though that was not it. It is the name of the manufacturer of rolls of a thin plastic sheet material - I looked it up on the web. If I think of it, I'll post it here.
I have to admit that the delam area does not seem to be growing.
Bill
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