"The Circuit breaker for the RAT heating supplies the RAT heating. That is it, full stop, dead end, nothing further. There is absolutely no connection to any other system including the take off warning."
So the (as found on pprune) "guilty"
were actually guilty of nothing more than de- energising an authorised cct to enable dispatch, working against the clock and (most likely) being denied authority to further fault find due to the aircraft being manned and on the line, a practice that occurs dailly around the globe.
So lets just forget trying to find scapegoats and approportion the blame where is belongs.