Among the justifications for "overheating" in the center wing tank of TW 800 was that a.) it was a hot July day, b.) the plane sat on the ground in the take-off queue for a considerable period and c.) it had not yet achieved sufficient altitude to cool the uninsulated tank.
Right or wrong, none of these factors apply to CI611.
All those 'hot' theories could never explain why 747's sitting on tarmacs all over the world in hot climates like India, Saudi, Pakistan even Dallas and Phoenix never spontaneously combusted.