What you have there is not completely uncommon. When it happened back home while the AB fleet was relatively new (around 4 years after entry into service) it sent a gentle shockwave through the pilot ranks. Properly reported, the engineers did their job and there never was a concern about the issue again.
Your findings are accurate; as well I seem to remember there are 4 sensors separated into 2 parallel signalling loops. Either one could trigger the opening of the valves.
The fuel incident that freaks me is not an OUTR TK one, but the AF with starvation-induced flame-out, while around 1500 kgs were still displayed on the FQI!
Last edited by FlightDetent; 22nd June 2018 at 21:41.