Pichu 17 is quite right
pichu 17 is quite right...a current indication would not be present on the ground for the RAT probe heater.
AS I said earlier, if the RAT probe was being heated on the ground the EPR information would be very wrong.
Therefore, I believe the plane "thought" it was in the air (when the RAT probe is heated)...being "in the air" the takeoff configuration warning wouldn't warn the pilot if the flaps/slats were not extended.
IF the mechanic just disabled the heater of the RAT probe and didn't understand the plane "thought" it was in the air, the stage was set for disaster.
Of course by "thought it was in the air" simply means the ground shift mechanism wasn't working properly in one way or another.