XPM, from what we know, it was the anti-ice/heating system of the RAT probe to have problems, so it has been switched off. In such a case, the RAT is supposed to be working normally unless ice form to prevent that.
Otherwise, please explain why it could case "a lot of problems", as just an abridged and highlighted manual section doesn't help in that.
Obviously, nobody at this point can exclude that any pre-existing fault, and/or the engineer actions, are indeed related to the crash.
It is simply that there is no direct indication of that being the case, anything else is pure speculation at this point.