With that wonderful Hijack utility (thanks Mark!), I can now see the temperature thresholds etc.. But, on my Mark2, they never change. Under the High Temperature Warning page, I have:
Threshold: +49C/+120F
Currently: -5C/+23F (really +43F)
Corrected by: -4C/-7F

It says this even if I leave it in the house all day. Shouldn't the current temp change?? What should I look for to see if it is broken?

John