For an inflight failure of the associated bus, the following messages may be displayed:
This is what it says in our DDG.
My understanding is that with bus failures you can never be sure exactly how much equipment you will lose, as sometimes only partial failures occur... (that is what I've been told at least, but my understanding of electronics is such that if you told me that it was all down to how the dedicated Bus troll was feeling on the day, I would believe it
)