Mike,
Yes, Gas Turbine Engines. But what design, what manufacturer?
Different airplanes and different engines behave differently.

But think about it. Heat gets generated at lower altitude. There is a
thermal lag. That heat gets dissipated at higher altitude. If you are
climbing VERY fast, the incoming air is less dense, you can set up a
cycle where heat is accumulating faster than it can be transferred due
to the denser air creating more combustion. Sort of like having an
extra boost of turbo charging. With the slower airspeed in a climb, and
if the engine is operating close to the edge of it's heat dissipation
maximum, it COULD cause overheating. Anyway, you see my point, I hope.
(Even if it is wrong in this case).

But I will yield, as I have no supporting data. The supporting data
would be a climb limitation in the manufacturers flight manual. I don't
have it, but I am sure it exists. These internet arguments are never
won anyway. I'm not really interested in winning. Probably should have
worded my initial statement a little less concretely. I honestly
thought this was the cause. Apparently not, or at least not sure yet,
or not public yet. Whatever.

It's just my theory. Sorry about the two pilots dying. That is a tough
one for the families I am sure. Whatever the reason is, I am sure we
all want it found out so that other pilots and passengers can benefit
from the knowledge.

Airline travel is very safe, statistically, by the way. But you already
know that.

Sorry if I ruffled any feathers..