@stilton:
I can't remember now whether leaving the Slats out suppresses the caution, or increases cooling, and cannot find a reference to it in the manuals.
However, once the caution has triggered, it is a 'No dispatch' condition, so many operators leave the Slats/Flaps at 1 during a transit stop.
Interestingly, the leak detector loops trigger at temperatures above 124 degrees C around the ducts, but the SOP is/was to keep the Slats/Flaps out at outside air temperatures above 30 degrees.
Our new SOP is to retract flaps on arrival on stand and to run them out after the refueller has gone - meaning one pilot has to stand outside and make sure the wing area is clear while the Slats/Flaps are moving out. As if we haven't got enough to do during a turnaround.