@columba: Sorry, but I think your translation lacks a bit. The article says:
... können die Sicherheitsbehörden noch nicht endgültig sagen, dass es sich ausschließlich um technisches Versagen gehandelt hat.
Which I think is more like
... the security authorities can not finally conclude yet, that it was a solely technical fault.
e.g. they can not prove (yet), that the distribution box failed on its own and nobody tampered with the plane's systems, but investigate in all directions.
Also they stated:
Unter Experten hatte unmittelbar nach Bekanntwerden des Vorfalls Skepsis hervorgerufen, dass sowohl die Funkanlage als auch zeitgleich die Vorrichtung zum Ablassen von Kerosin ausgefallen seien.
Immediatly after the incident became known there was (not "is") scepticism generated amongst experts (unnamed "experts", not "security authorities"), because both the radio communication system (not "all communication systems") and the fuel dump system failed at the same time.
In hindsight this failure mode is logical if both are driven by the same failing power distribution system.
Then comes a lot of conjecture and hearsay but no source or prove.
According to Berlin Newspaper "Der Tagespiegel" it is not clear whether it was a technical error or not. Security authorities are skeptical since not only all communication systems broke down but also the ability to dumb fuel. They also got hint from a befriended country.
I think a correct translation is important, especially with such a weasel-worded article. Sorry, but your translation gives it a tone, that was not there.
What I still would like to understand and maybe the experts can help: Is there really a power distribution system in the A340 that can take out multiple subsystems at the same time? Wouldn't this create a single point of failure?