Sid - a fault within a black box such as the display system does not necessarily mean that it fails to function. The reporting is simply of maintenance issues which will at some time require attention. Whilst it is possible that a fault report could indicate a complete melt-down, it is far more likely that there was some very minor malfunction requiring routine attention. A conversation with your crewmen will tell you more about this. I have worked in the design team for similar items.
On another topic, do you find that the fuel sensors play up more during late autumn, and when a warm front is followed by a cold night?