Sharm El Sheik last night: the air temperature was 37 degrees !
Retracted the flaps completely so the precious darling fuelers didn't get upset, and despite the +37 degree air temperature, we didn't get a wing air leak caution.
I am becoming more certain that it is actually strong sunlight on the slats (with a high ambient temperature) that is the cause of the false overheat, so at night it probably won't occur.