I have also a z61t and I did raise a support request to lenovo, will see,

still, I was a bit puzzled, so did a few tests, on mine (with an earlier
version of firmware),
when in auto mode and full load:
- default speed is ~2800rpm (level 4)
- fan speed increases to ~3500rpm (level 7) at 92deg,
- then goes back to level 4 at 86-87deg.
- did not see it go back to level 2, even when below 40deg,

I wonder if this is a normal behaviour though,
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